C PROGRAMS : CONTROL STRUCTURES

1. Program to multiply 2 number without using * operator

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
 // Variable for 2 numbers, and for result
 int a, b, r=0;
 
 // Inputting 2 integers
 printf("Enter two integers:");
 scanf("%d %d",&a,&b);
 
 // Multiplying 2 numbers
 if(a>b)
 {
 while(b)
 {
  r=r+a;
  b--;
 }
 }
 else
 {
 while(a)
 {
  r=r+b;
  a--;
 }
 }
  
 // Displaying result
 printf("Product of two number:%d",r);
 
 getch(); // Linux user - Remove this

 return 0;
}

2. Program to determine armstrong number

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
// variable for a=numbern, n=to copy number, d=digit
int a,n,d=0,sum=0;

// Inputting number
printf("Enter any number to determine whether it is armstorng or not:");
scanf("%d",&a);

// copying number in n
n=a;

// Determining whether number is armstrong or not
while(n!=0)
{
           d=n%10;
           sum=sum+d*d*d;
           n=n/10;
}
           
// Displaying Whether number is armstrong or not
if(a==sum)
printf("Armstron no");
else
printf("not armstrong");
   
getch(); // Linux user - Remove this

return 0;
}

3. Program to input time in seconds and convert them into hours, minutes and seconds and display it

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
 /* Variable for time in second, converted in hour, converted in minutes 
 and converted in seconds, r for remainder */
 int ts, ch=0, cm=0, cs, r=0;
 
 // Inputting time in second
 printf("Enter time in seconds:");
 scanf("%d", &ts);
 
 // Converting in hours, minutes and seconds 
 if(ts<60)
 cs=ts;
 
 else if(ts<3600)
 {
 cm=ts/60;
 cs=ts%60; 
 }
 
 else if(ts>3600)
 {
 ch=ts/3600;
 r=ts%3600;
 if(r>60)
 {
  cm=r/60;
  r=r%60;
 }
 if(r<60)
 cs=r;
 }
 
 // Displaying seconds in hour, minutes and seconds
 printf("Time in hour minutes and seconds: %d/%d/%d",ch,cm,cs);
 

 getch(); // Linux user - Remove this

 return 0;
 
}

4. Program to determine palindrome number

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
// variable for a=number, n=to copy number, d=digit, rev=reverse of number
int a,n,d=0,rev=0;

// Inputting number
printf("Enter any number to determine whether it is Palindrome or not:");
scanf("%d",&a);

// copying number in n
n=a;

// Determining whether number is palindrome or not
while(n!=0)
{
           d=n%10;
           rev=rev*10+d;
           n=n/10;
           }
           
           // Displaying Whether number is palindrome or not
           if(a==rev)
           printf("Palindrome number");
           else
           printf("Not a Palindrome Number");
          
     getch(); // Linux user - Remove this

     return 0;
     
     }

5. Program showing the use of goto statement

#include<stdio.>
#include<conio.h> // Linux user - Remove this

int main()
{
int i=0;

goto a;
na:       
printf("Not allowed = %d\n",i);
a:
    for(i=i+1;i<=35;i++)
    {
        if(i==15||i==30)
        goto na;
        else
        printf("Allowed =%d\n",i);
    }
        
 getch(); // Linux user - Remove this

 return 0;
     
}

Author : Mantu Kumar

Share this

Related Posts