Help me following c problem using as function declaration , function call, and function definition

Question

#include<stdio.h>

int main()

{

int arr[5],i,item;

printf("enter any five element=\n");

for(i=0;i<5;i++)

{

scanf("%d",&arr[i]);

}

printf("enter the item to be searched=");

scanf("%d",&item);

for(i=0;i<5;i++)

{

if(arr[i]==item)

{

printf("%d is found in the series",item);

break;

}}

if(i==5)

{

printf("%d is not found in the series",item);

}

return 0;

}

Answer 1

I hope the commented code below helps you understand the difference between function call, declaration, and definition.

#include <stdio.h>

// Function declaration tells the compiler what the signature of the function is,
// but it does not tell how the function works.
// A function declaration must come before any function call.
int Add(int a, int b);

// Function definition tells the compiler what exactly the function does.
// We specify the body of the function here.
// A function definition is also a function declaration.
// Function defition can be placed anywhere, it doesn't have to be before
// the function call, unless it's also your function declaration (no
// "pre-declaration" provided like above)
int Add(int a, int b)
{
    return a + b;
}

int main()
{
    int a = 2;
    int b = 3;
    int sum = Add(a, b); // This is a function call, when you provide the function name and the arguments
    printf("%d + %d = %d\n", a, b, sum); // This is also a function call, but printf is declared in stdio.h
    return 0;
}