This consists of the programs in the C language.

1. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 1
1(A)
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,temp;
printf("enter the a and b values");
scanf("%d%d",&a,&b);
temp=a;
a=b;
b=temp;
printf("after swapping the a and b values are %d and %d",a,b);
getch();
}
1(B)
#include<stdio.h>
#include<conio.h>
void main()
{
int i, j, num, isprime;
printf("enter any number to print prime");
scanf("%d",&num);
printf("all prime factors of %d are:",num);
for(i=2;i<=num;i++)
{
if(num%i==0)
{
isprime=1;
for(j=2;j<=i/2;j++)
{
if(i%j==0)
{
isprime=0;
break;
}
}
if(isprime==1)
{
printf("%d",i);
}
}
}
getch();
}

2. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 2
1(C)
#include<stdio.h>
#include<conio.h>
void main()
{
int n;
float x, y, pi=3.14;
printf("enter cosine value");
scanf("%d", &n);
x=(n*pi)/180;
y=cos(x);
printf("the value of cos is %f is %f",x,y);
getch();
}
2(A)
#include<stdio.h>
#include<conio.h>
void main()
{
int n, sum=0,d;
clrscr();
printf("Enter any integer:");
scanf("%d", &n);
while(n>0)
{
d=n%10;
sum=sum+d;
n=n/10;
}
printf("sum of individual digits is %d",sum);
getch();
}
2(B)
#include<stdio.h>
#include<conio.h>
void main()
{
int a=0,b=1,c,n,i;
clrscr();
printf("Enter no. of terms:");
scanf("%d", &n);
printf("The Fibonacci sequence is:");
printf("%d%d", a,b);
for(i=3;i<=n;i++)

3. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 3
{
c=a+b;
printf("%d",c);
a=b;
b=c;
}
getch();
}
2(C)
#include<stdio.h>
#include<conio.h>
void main()
{
int i, j, n, count=0;
clrscr();
printf("Enter the limit:");
scanf("%d", &n);
printf("The prime numbers are:");
for(i=2;i<=n;i++)
{
for(j=1;j<=i;j++)
{
if(i%j==0)
count++;
}
if(count==2)
printf("%dt", i);
}
getch();
}
3(A)
#include<stdio.h>
#include<conio.h>
void main()
{
float fh, cl;
int choice;
printf("n1. convert temperature from fahrenheit to celcius");
printf("n2. convert temperature from celsius to fahrenheit");
printf("n enter your choice");
scanf("%d",&choice);
if(choice==1)
{
printf("n enter temperature in fahrenheit");

4. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 4
scanf("%f",&fh);
cl=(fh-32)/1.8;
printf("temperature in celsius is %2f", cl);
}
else if(choice==2)
{
printf("n enter temperature in celsius");
scanf("%f",&cl);
fh=(cl*1.8)+32;
printf("temperature in fahrenheit is %2f",fh);
}
else
{
printf("n invalid choice");
}
getch();
}
3(B)
#include<stdio.h>
#include<conio.h>
void main()
{
int i, j, n;
printf("enter the pyramid range");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
for(j=0;j<n-i;j++)
{
printf(" ");
}
for(j=0;j<i;j++)
{
printf("%4d",i);
}
printf("n");
}
getch();
}
3(C)
#include<stdio.h>
#include<conio.h>
void main()
{

5. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 5
int i, j, s, r, c=1;
printf("enter the number of rows");
scanf("%d",&r);
for(i=0;i<r;i++)
{
for(s=1;s<=r-i;s++)
{
printf(" ");
}
for(j=0;j<=i;j++)
{
if(j==0||i==0)
c=1;
else
c=c*(i-j+1)/j;
printf("%3d",c);
}
printf("n");
}
getch();
}
4(A)
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
int i,n=4,x;
long int fact=1;
float sum=1;
printf("enter the x value:");
scanf("%d", &x);
for(i=1;i<=n;i++)
{
fact=fact*i;
if(i%2==0)
{
if(i==2||i==10||i==6)
sum+=-pow(x,i)/fact;
else
sum+=pow(x,i)/fact;
}
}
printf("sum is %f", sum);

6. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 6
getch();
}
4(B)
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
int a, b, c;
char ch;
printf("enter your operator (+, -, *, %, /)n");
scanf("%c",&ch);
printf("enter the values of a, b");
scanf("%d%d",&a,&b);
switch(ch)
{
case '+':c=a+b;
printf("addition of two numbers is %d",c);
break;
case '-':c=a-b;
printf("subtraction of two numbers is %d",c);
break;
case '*':c=a*b;
printf("multiplication of two numbers is %d",c);
break;
case '%':c=a%b;
printf("remainder of a and b is %d",c);
break;
case '/':if(b==0)
printf("divide by zero errorn");
else
{
c=a/b;
printf("quotient of a and b is %d",c);
}
break;
default:
printf("invalid operator");
break;
}
getch();
}
5(A)(i)
#include<stdio.h>

7. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 7
#include<conio.h>
unsigned int factorial(int n);
void main()
{
int n,i;
long int fact;
clrscr();
printf("Enter the number: ");
scanf("%d",&n);
if(n==0)
printf("Factorial of 0 is 1n");
else
printf("Factorial of %d Using Recursive Function is %dn",n,factorial(n));
getch();
}
/* Recursive Function*/
unsigned int factorial(int n)
{
return n>=1 ? n * factorial(n-1) : 1;
}
5(A)(ii)
#include<stdio.h>
#include<conio.h>
#include<math.h>
unsigned int GCDRecursive(unsigned m, unsigned n);
int main(void)
{
int a,b;
clrscr();
printf("Enter the two numbers whose GCD is to be found: ");
scanf("%d%d",&a,&b);
printf("GCD of %d and %d Using Recursive Function is %dn",a,b,GCDRecursive(a,b));
getch();
}
/* Recursive Function*/
unsigned int GCDRecursive(unsigned m, unsigned n)
{
if(n>m)
return GCDRecursive(n,m);
if(n==0)
return m;
else
return GCDRecursive(n,m%n);
}

8. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 8
5(B)
#include<conio.h>
#include<stdio.h>
/* Recursive Function*/
void hanoiRecursion( int num,char ndl1, char ndl2, char ndl3)
{
if ( num == 1 ) {
printf( "Move top disk from needle %c to needle %c.", ndl1, ndl2 );
return;
}
hanoiRecursion( num - 1,ndl1, ndl3, ndl2 );
printf( "Move top disk from needle %c to needle %c.", ndl1, ndl2 );
hanoiRecursion( num - 1,ndl3, ndl2, ndl1 );
}
void main()
{
int no;
clrscr();
printf("Enter the no. of disks to be transferred: ");
scanf("%d",&no);
if(no<1)
printf("nThere's nothing to move.");
else
printf("nRecursive");
hanoiRecursion(no,'A','B','C');
getch();
}
6(A)
#include <stdio.h>
#include <conio.h>
/* Main function is starting */
main()
{
/* Variable Declaration part */
int i,n,small=0,large=0;
int a[30];
/* Clearing previous output on output screen */
clrscr();
/* Giving Upper bound + 1 of the array */
printf("n Enter size of the array:");
scanf("%d",&n);
/* Array Initialization using scanf function and for loop */
printf("n Enter values in array elements:");

9. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 9
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
/* logic to find smallest element in array */
small = a[0];
for(i=0;i<n;i++)
{
if(small > a[i])
small = a[i];
}
printf("n The smallest element in given array is %d",small);
/* logic to find largest element in array */
large=0;
for(i=0;i<n;i++)
{
if(large < a[i])
large = a[i];
}
printf("n The largest element in given array is %d",large);
printf("n :End of the Main Program:");
getch();
}
6(B)(i)
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<math.h>
void main()
{
int a[10][10],b[10][10],d[10][10],n,i,j,r,c;
printf("enter no. of rows");
scanf("%d",&r);
printf("enter no. of col");
scanf("%d",&c);
printf("enter 1st matrix ele");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("enter 2nd matrix ele");

10. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 10
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
scanf("%d",&b[i][j]);
}
}
printf("resultant matrix is");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
d[i][j]=a[i][j]+b[i][j];
printf("%d",d[i][j]);
}
printf("n");
}
getch();
}
6(B)(ii)
#include <conio.h>
#include <stdio.h>
/* declaring function prototypes */
void init_mat (int [][10], int, int);
void print_mat (int [][10], int, int);
void add_mat (int [][10], int [][10], int [][10], int, int);
/* Main Function starting */
main()
{
int r1,r2,c1,c2;
int a[10][10],b[10][10],c[10][10];
clrscr();
/* Giving order of the Matrix - A */
printf("n Enter the order of Matrix – A:");
scanf("%d%d",&r1,&c1);
/* Giving order of the Matrix - B */
printf("n Enter the order of Matrix – B:");
scanf("%d%d",&r2,&c2);
if(r1!=r2 || c1!=c2)
{
printf("n Matrix Addition is not possible ");
getch();
exit(0);
}
else
{

11. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 11
/* Matrix - A */
printf("n Enter the elements of Matrix – A:");
init_mat(a,r1,c1);
printf("n The elements of Matrix - A");
print_mat(a,r1,c1);
/* Matrix - B */
printf("n Enter the elements of Matrix - B");
init_mat(b,r2,c2);
printf("n The elements of Matrix - B");
print_mat(b,r2,c2);
/* Function call to Matrix addition logic */
add_mat(a,b,c,r1,c1);
/* Matrix after addition */
printf("n The elements of Matrix - C after addition of A & B");
print_mat(c,r1,c1);
}
getch();
}
/* Function for two dimensional array initialization */
void init_mat(int mat[][10],int r,int c)
{
int i,j;
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
scanf("%d",&mat[i][j]);
}
}
}
/* Function for printing element in Matrix form */
void print_mat(int mat[][10],int r, int c)
{
int i,j;
printf("n");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf(" %d ",mat[i][j]);
}
printf("n");
}
}
/* function for matrix addition logic */
void add_mat(int a[][10],int b[][10],int c[][10],int r1,int c1)
{
int i,j;

12. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 12
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
{
c[i][j] = a[i][j]+b[i][j];
}
}
}
7(A)
#include <stdio.h>
#include <conio.h>
#include <string.h>
main()
{
char str[32],strdp[32];
int mask,i;
clrscr();
printf("Enter a binary number:");
scanf("%s",str);
strcpy(strdp,str); /* creating duplicate copy */
for(i=0;i<strlen(str);i++) /* computing 1's complement */
{
if(str[i]=='1')
str[i]='0';
else
str[i]='1';
}
printf("1's complement of %s is %sn",strdp,str);
mask=1;
for(i=strlen(str)-1;i>=0;i--) /* computing 2's complement */
{
if(mask==1)
{
if(str[i]=='1')
{
str[i]='0';
mask=1;
}
else
{
str[i]='1';
mask=0;
}
}

13. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 13
}
printf("2's complement of %s is %s",strdp,str);
getch();
}
7(B)
#include <stdio.h>
#include <conio.h>
main()
{
char roman[30];
int deci=0;
int len,i,d[30];
clrscr();
printf("Enter a Roman numeral:");
scanf("%s",roman);
len=strlen(roman);
for(i=0;i<len;i++)
{
switch(roman[i])
{
case 'M': d[i]=1000; break;
case 'D': d[i]= 500; break;
case 'C': d[i]= 100; break;
case 'L': d[i]= 50; break;
case 'X': d[i]= 10; break;;
case 'V': d[i]= 5; break;
case 'I': d[i]= 1;
}
}
for(i=0;i<len;i++)
{
if(i==len-1 || d[i]>=d[i+1])
deci += d[i];
else
deci -= d[i];
}
printf("The Decimal equivalent of Roman numeral %s is %d", roman, deci);
getch();
}
8(A)(i)
#include <stdio.h>
#include <conio.h>
/* Declaring function prototypes */
void ins_substr(char [], char [], int, int);

14. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 14
/* main function is starting */
main()
{
int p,n,i,j;
char str[50],substr[50];
clrscr();
/* Initializing character array */
puts("n Enter the String:");
gets(str);
fflush(stdin);
/* Entering the position where you want to insert a substrprintf("Enter the specific position
");
scanf("%d",&p);
printf("n Enter the Number of Characters:");
scanf("%d",&n);
fflush(stdin);
puts("n Enter Sub-String:");
gets(substr);
/* function call to inserting string in main string */
ins_substr(str,substr,p,n);
printf("n :: End of the main program ::");
getch();
}
/* logic to insert sub string in main string */
void ins_substr(char str[], char substr[], int p, int n)
{
int q,i,j;
q=p-1;
for(i=q,j=n;str[i]!='0';i++,j++)
substr[j]=str[i];
substr[j]='0';
for(j=0,i=q;substr[j]!='0';j++,i++)
str[i]=substr[j];
str[i]='0';
printf("n The string after inserting substring :");
puts(str);
}
8(A)(ii)
#include <stdio.h>
#include <conio.h>
/* declaring prototype of function */
void del_str(char [],int, int);
/* Main function starting */
main()
{
int n,p;
char str[30];

15. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 15
clrscr();
printf("n Enter the String::");
gets(str);
fflush(stdin);
printf("n Enter the position from where the characters are to be deleted:");
scanf("%d",&p);
printf("n Enter Number of characters to be deleted:");
scanf("%d",&n);
/* function call to deletion of n-characters */
del_str(str,p,n);
printf("::End of the Main program::");
getch();
}
/* function call to Logic of delete n-characters from string */
void del_str(char str[],int p, int n)
{
int i,j;
for(i=0,j=0;str[i]!='0';i++,j++)
{
if(i==(p-1))
{
i=i+n;
}
str[j]=str[i];
}
str[j]='0';
/* the string after deletion */
puts(" The string after deletion of characters::");
puts(str);
}
8(B)
#include <stdio.h>
#include <conio.h>
/* Main function definition */
main()
{
int i,n,j,len=0;
char str[30];
clrscr();
printf("n Enter String:");
gets(str);
/* logic to checking string for palindrome */
for(i=0;str[i]!='0';i++)
len++;
printf("n The length of the string is %d",len);
for(i=0,j=len-1;str[i]!='0';i++,j--)
{

16. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 16
if(str[i]!=str[j])
{
printf("n :The given string is not a palindrome:");
getch();
exit(0);
}
}
printf("n :the given string is palindrome:");
getch();
}
9(A)
#include <stdio.h>
#include <conio.h>
#include <string.h>
/* main function is starting */
main()
{
int i,j,n;
char s[40],t[40];
clrscr();
printf("n Enter the string:");
gets(s);
fflush(stdin);
printf("n Enter the sub string:");
gets(t);
/* logic to search sub string */
i=0;
j=0;
while( s[i] != '0')
{
if((s[i] == t[j]) && (s[i+1] == t[j+1]))
break;
if(i==strlen(s))
{
printf("-1");
getch();
exit(0);
}
i++;
}
j=0;
n=i;
while(t[j] != '0')
{
if(s[i] == t[j])
{
i++;

17. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 17
j++;
}
else
{
printf("-1");
getch();
exit(0);
}
}
printf("n The string is found at %d",n+1);
getch();
}
9(B)
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char s[100];
int i,l=0,c=0,w=0;
clrscr();
puts("enter a string");
scanf("%[^#]s",s);
for(i=0;s[i]!='0';i++)
{
c=c+1;
if(s[i]==' '||s[i]=='n')
w=w+1;
if(s[i]=='n')
l=l+1;
}
printf("the number of characters in a given text is %dn",c);
printf("the number of words in a given text is %dn",w+1);
printf("the number of lines in a given text is %dn",l+1);
getch();
}
10
#include<stdio.h>
#include<conio.h>
#include<math.h>
struct comp
{
int real,img;
};
struct comp a,b,c;
void read();
void write();

18. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 18
void add();
void mul();
void main()
{
int ch;
clrscr();
printf("enter choicen1.addition of two complex numbersn2. multiplication of two complex
numbersn");
scanf("%d",&ch);
switch(ch)
{
case 1:
read();
add();
write();
break;
case 2:
read();
mul();
write();
break;
default:
printf("invalid choice");
}
getch();
}
void read()
{
printf("enter real and imaginary part of first complex number");
scanf("%d%d",&a.real,&a.img);
printf("enter real and imaginary part of second complex number");
scanf("%d%d",&b.real,&b.img);
}
void write()
{
printf("the resultant complex number is %d+%di",c.real,c.img);
}
void add()
{
c.real=a.real+b.real;
c.img=a.img+b.img;
}
void mul() //(a+bi)(c+di)=(ac-bd)+(ad+bc)i//
{
c.real=a.real*b.real-a.img*b.img;
c.img=a.real*b.img+a.img*b.real;
}
11(A)

19. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 19
#include<stdio.h>
#include<conio.h>
void main()
{
char ch;
FILE *fp;
fp=fopen("8a.c","r");
if(fp==NULL)
printf("error reading filen");
else
while((ch=fgetc(fp))!=EOF)
printf("%c",ch);
fclose(fp);
getch();
}
11(B)
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
int main()
{
FILE *fptr1,*fptr2;
char file1[100],c;
printf("enter the file name to open for readingn");
scanf("%s",file1);
fptr1=fopen(file1,"r");
if(fptr1==NULL)
{
printf("cannot open file%s",file1);
exit(0);
}
printf("enter the filename to open for writingn");
scanf("%s",file1);
fptr2=fopen(file1,"w");
if(fptr2==NULL)
{
printf("cannot open file %sn",file1);
exit(0);
}
c=fgetc(fptr1);
while(c!=EOF)
{
fputc(c,fptr2);
c=fgetc(fptr1);

20. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 20
}
printf("contents copied to %s",file1);
fclose(fptr1);
fclose(fptr2);
return 0;
}
12(A)
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <process.h>
void main(int argc, char *argv[])
{
char a[15];
char s[20];
char n;
int k;
int j=0;
int i;
int len;
FILE *fp;
if(argc!=3)
{
puts("Improper number of arguments.");
exit(0);
}
fp = fopen(argv[1],"r");
if(fp == NULL)
{
puts("File cannot be opened.");
exit(0);
}
k=atoi(argv[2]);
n = fread(a,1,k,fp);
a[n]='0';
len=strlen(a);
for(i=len-1;i>=0;i--)
{
s[j]=a[i];
printf("%c",s[j]);
j=j+1;
}
s[j+1]='0';
getch();
}
12(B)
#include <stdio.h>

21. C Programming Laboratory
Vikram Neerugatti, Assistant Professor, SVCET, Chittoor Page 21
#include <stdlib.h>
int main()
{
FILE *fs1,*fs2,*ft;
char ch, file1[20], file2[20], file3[20];
printf("Enter name of first filen");
gets(file1);
printf("Enter name of second filen");
gets(file2);
printf("Enter name of file which will store contents of two filesn");
gets(file3);
fs1 =fopen(file1,"r");
fs2 =fopen(file2,"r");
if( fs1 == NULL || fs2 == NULL )
{
perror("Error ");
printf("Press any key to exit...n");
getch();
exit(EXIT_FAILURE);
}
ft =fopen(file3,"w");
if( ft == NULL )
{
perror("Error ");
printf("Press any key to exit...n");
exit(EXIT_FAILURE);
}
while(( ch =fgetc(fs1))!= EOF )
fputc(ch,ft);
while(( ch =fgetc(fs2))!= EOF )
fputc(ch,ft);
printf("Two files were merged into %s file successfully.n",file3);
fclose(fs1);
fclose(fs2);
fclose(ft);
return 0;
}