try yourself |run program

#include <stdio.h> 
#include <conio.h> 
void main(){ 
 int m;
 int n;
 int p;
 clrscr();
 printf("Enter value of m: ");
 scanf("%d",&m);
 printf("\n Enter value of n: ");
 scanf("%d",&n);
 p = m < n; /* in program output we can see 1 for true and 0 for false */
 printf("\n value of m = %d",m);
 printf("\n value of n = %d",n);
 printf("\n value of p = %d",p);
 getch();
}

Program Output

Enter value of m: 10
Enter value of n: 20
value of m = 10
value of n = 20
value of p = 1