C89 Programming The program will use incrementors and decrementors in an add() f

Question

C89 Programming

The program will use incrementors and decrementors in an add() function to substitute for the addition fuction. It will also need to use recursion to add the two numbers. Can't use pointers, only recursion with incrementors and decrementors, and the program will need to work with both positive and negative values. Here's what I have so far:

#include <stdio.h>           //standard io header

int add (int n, int m);

int main(void){
   int n, m, sum;
  
   printf("Enter the 1st number: ");
   scanf("%d", &n);
  
   printf("Enter the 2nd number: ");
   scanf("%d", &m);  
  
   printf("Sum of two numbers : %d", sum);
   return 0;
}

int add (int n, int m){
   int sum;
  
   while(m--){
       sum++;
   }
  
   while(n--){
       sum++;
   }
   return sum;
}

Explanation / Answer

#include <stdio.h> //standard io header
int add (int n, int m);
int main(void){
int n, m, sum;
  
printf("Enter the 1st number: ");
scanf("%d", &n);
  
printf("Enter the 2nd number: ");
scanf("%d", &m);
sum=add(n, m);
printf("Sum of two numbers : %d", sum);
return 0;
}
int add (int n, int m){
int sum=0;
  
if(n!=0){
return sum+add(n-1,m);
}
  
if(m!=0){
return sum+add(n,m-1);
}
return sum;
}

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