/* C program to find LCM of two positive integers entered by user */ 
#include<stdio.h> 
int main() 
{ 
int n1,n2,temp1,temp2; 
printf("Enter two positive integers: "); 
scanf("%d %d",&n1,&n2);
 temp1=n1;
 temp2=n2;
   while(temp1!=temp2)
    { 
      if(temp1>temp2)
         temp1-=temp2; 
      else 
        temp2-=temp1;
    }
 printf("LCM of two numbers %d and %d is %d", n1, n2, (n1*n2)/temp1);
return 0;
}

Output:
Enter two positive numbers: 15 9 
LCM of two numbers 15 and 9 is 45

/* C Program to Find Highest Common Factor. */
#include<stdio.h>
int main() 
{ 
int num1,num2; 
printf("Enter two integers: "); 
scanf("%d %d",&num1,&num2); 
printf("HCF of %d and %d is ",num1 , num2); 
 while(num1!=num2) 
   { 
     if(num1>num2) 
       num1-=num2; 
     else num2-=num1; 
   } 
 printf("%d",num1); 
return 0; 
}

Output:
Enter two integers: 
14 35 
HCF of 14 and 35 is 7

/* C program to check whether a year is leap year or not using if else statement.*/ 
#include<stdio.h>
int main()
{ 
int year;
printf("Enter a year: "); 
scanf("%d",&year); 
if(year%4 == 0) 
  { 
    if( year%100 == 0) /* Checking for a century year */ 
      { 
        if ( year%400 == 0) 
          printf("%d is a leap year.", year); 
        else 
          printf("%d is not a leap year.", year); 
      } 
   else 
     printf("%d is a leap year.", year ); 
  } 
else 
 printf("%d is not a leap year.", year);
return 0; 
}

Output 1:
Enter year: 2000 
2000 is a leap year.
Output 2:
Enter year: 1900
1900 is not a leap year.

/* C program to find largest number using if...else statement */ 
#include<stdio.h>
int main()
{ 
float a, b, c; 
printf("Enter three numbers: "); 
scanf("%f %f %f", &a, &b, &c); 
if (a>=b) 
{ 
  if(a>=c) 
   printf("Largest number = %.2f",a); 
  else 
   printf("Largest number = %.2f",c); 
} 
else 
{ 
  if(b>=c) 
   printf("Largest number = %.2f",b); 
 else 
   printf("Largest number = %.2f",c); 
} 
return 0; 
}

Output:
Enter three numbers: 
12.2 
13.452 
10.193 
Largest number = 13.45

/* Source code to find ASCII value of a character entered by user */ 
#include<stdio.h>
int main()
{ 
char c; 
printf("Enter a character: "); 
scanf("%c",&c); /* Takes a character from user */ 
printf("ASCII value of %c = %d",c,c); 
return 0; 
} 
----------------------------------------------------------------------------------------
/* This program computes the size of variable using sizeof operator.*/ 
#include<stdio.h>
int main()
{ 
int a; 
float b; 
double c; 
char d; 
printf("Size of int: %d bytes\n",sizeof(a)); 
printf("Size of float: %d bytes\n",sizeof(b)); 
printf("Size of double: %d bytes\n",sizeof(c)); 
printf("Size of char: %d byte\n",sizeof(d)); 
return 0; 
} 

Output:
Size of int: 4 bytes 
Size of float: 4 bytes 
Size of double: 8 bytes 
Size of char: 1 byte