Programs on functions in C

by 
/*
Author : ITVoyagers (https://itvoyagers.in/)

Date :25th December 2018

Description : Programs On Function.
*/

#include<stdio.h>

/******** declaring function **********/

float sum(float n,float m);
float sub(float n,float m);
float mul(float n,float m);
float div(float n,float m);

void main()
{
    float x,y;
    char s;
    scanf("%f %c %f",&x,&s,&y);

/********* switch statement **********/

    switch(s)
    {
        case '+':
            printf("%f",sum(x,y));
        break;
        case '-':
            printf("%f",sub(x,y));
        break;
        case '*':
            printf("%f",mul(x,y));
        break;
        default:
            printf("%f",div(x,y));
        break;
    }
}

/******** defining function **********/

float sum(float n,float m)
{
    return n+m;
}

float sub(float n,float m)
{
    return n-m;
}

float mul(float n,float m)
{
    return n*m;
}

float div(float n,float m)
{
    return n/m;
}

Output:
8
*
9
72.000000

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