Explain the Basic Structure of a C Program with an Example.

c-program-structure.cpp

/*
 * Name: Sample Program
 * Author: OnlineClassNotes.COM
 * Create Date: 26/11/2016
 * Last Modified: 27/11/2016
 * Tested at https://www.onlinegdb.com/online_c++_compiler using Language: C
 */
 
//Linking required library
#include <stdio.h>
 
//defining a constant
#define MAX_ARRAY_LENGTH 20
 
//defining a global variable
int max_input_length = 15;
 
//declaring an user defined function which has been defined later
float addNumbers(float a, float b);
 
int main(){
    //declaring a local variable for main()
    int localVariable = 50;
     
    //Accessing a defined constant
    printf("Max array length is %d\n", MAX_ARRAY_LENGTH);
     
    //Accessing a global variable
    printf("Max input length is %d\n", max_input_length);
 
    //Accessing an user defined function, declared in gloabl declaration section
    printf("Summation of 5.5 and 8.3 = %f\n",addNumbers(5.5,8.3));
     
    return 0;
    }
 
//defining an user defined function which has been declared earlier.
float addNumbers(float a, float b){
    return (a+b);
    }

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