try yourself |run program

#include <stdio.h> 
#include <conio.h> 
void main(){
 int m;
 int n;
 int p;
 clrscr();
 printf("\n This is a nested if() else statement program.");
 printf("\n Enter value of m: ");
 scanf("%d",&m);
 printf("\n Enter value of n: ");
 scanf("%d",&n);
 printf("\n Enter value of p: ");
 scanf("%d",&p);
 if(m > 100){
  if(n > 75){
   if(p > 50){
   printf("\n HELLO WORLD ");
   }
  }
 }
 else{
 if(m < 100){
  if(n < 75){
   if(p < 50){
   printf("\n HELLO FRIENDS ");
   }
  }
 }
 }
 getch();
}

Program Output

This is a nested if() else statement program.
Enter value of m: 10
Enter value of n: 20
Enter value of p: 30
HELLO FRIENDS