Question

Write a C program requesting the user to input two integer numbers and then requesting the user to either add, subtract, or multiply the two numbers (choose 0 to add, 1 to subtract, or 2 to multiply. Declares three separate functions for these choices to come after main(). Program needs to use a pointer to these three functions to perform the requested action. Must print to output.

Answer 1

#include <stdio.h>
int add(int,int);
int sub(int,int);
int mul(int,int);

int main()
{
int n1,n2,op;
printf("Enter 2 numbers : ");
//reading 2 numbers from user
scanf("%d%d",&n1,&n2);
printf("choose 0 to add, 1 to subtract, or 2 to multiply");
scanf("%d",&op);
//declaring function pointer
int (*fp)(int, int);
//assinging function name based on user input
if(op==0)
fp=add;
if(op==1)
fp=sub;
if(op==2)
fp=mul;
  
printf("Result is : %d",fp(n1,n2));
return 0;
}
int add(int n1,int n2){
return n1+n2;
}
int sub(int n1,int n2){
return n1-n2;
}
int mul(int n1,int n2){
return n1*n2;
}