Function prototype and definition

Function Prototype:

A function prototype is also known as a function declaration.

A function declaration tells the compiler about a function name and how to call the function.

It defines the function before it is being used or called.

A function prototype needs to be written at the beginning of the program.


Syntax:

return-type function-name (arg-1, arg-2, ...);

Example:

void addition(int, int);


Function Definition:

A function definition defines the functions header and body.

A function header part should be identical to the function prototype.

  • Function return type
  • Function name
  • List of parameters

A function body part defines function logic.

  • Function statements

Syntax:
return-type function-name(arg-1, arg-2, ...);
{
        //... function body
}
Example:
void addition(int x, int y)
{
    printf("Addition is = %d",(x+y));
}

Drafted on 🌏 by,

Jal


☮

peace

Comments

Post a Comment

Popular posts from this blog

C program to read and display book information using structure

Program: #include<stdio.h> struct book {     char title[40];     int pages;     float price;     int ratings; }; int main() {     struct book book1;     printf("Enter Book Title: ");     gets(book1.title);     printf("Enter Book Pages:");     scanf("%d", &book1.pages);     printf("Enter Book Price:");     scanf("%f", &book1.price);     printf("Enter Book Ratings:");     scanf("%d", &book1.ratings);          printf("\nBook using simple structure variable.\n");     printf("Book Title: %s\n", book1.title);     printf("Book Pages: %d\n", book1.pages);     printf("Book Price: %f\n", book1.price);     printf("Book Ratings: %i\n", book1.ratings);  } Output: Enter Book Title: Life of pi Enter Book Pages:401 Enter Book Price:320 Enter Book Ratings:4 Book using simple structure variable. Book Title: Life of pi Book Pages: 401 Book Price: 320.000000 Book Rating
Read more

Count positive, negative and zero values in an array

Program: #include <stdio.h> void main() {     int num[10],i,pos=0,neg=0,zero=0;     for(i=0;i<10;i++)     {         printf("Enter array element: ");         scanf("%d",&num[i]);         if(num[i]>0)             pos=pos+1;         else             if(num[i]<0)                 neg=neg+1;             else                 zero=zero+1;     }     printf("Positive=%d, Negative=%d, Zero=%d",pos,neg,zero); } Output: Enter array element: -40 Enter array element: -30 Enter array element: -20 Enter array element: -10 Enter array element: 0 Enter array element: 10 Enter array element: 20 Enter array element: 30 Enter array element: 40 Enter array element: 50 Positive=5, Negative=4, Zero=1 Drafted on 🌏 by, Jal ☮ peace
Read more

Maximum value from array

Program: #include <stdio.h> void main() {     int arr[10]={10,20,30,40,50,60,70,80,90,100};     int i,max;          max=arr[0];          for(i=1;i<10;i++)     {         if(arr[i]>max)             max=arr[i];     }          printf("Maximum number is: %d",max); } Output: Maximum number is: 100 Drafted on 🌏 by, Jal ☮ peace
Read more