Something

#include<stdio.h>

void main()
{
	float a;
	float b;
	float c;
	int calc;
	clrscr();
	printf("Welcome to My Simple Calculator!");
	printf("\nPush Enter When Ready");
	printf("\nEnter First Number :");
	scanf("%f", &a);
	printf("Enter Second Number :");
	scanf("%f", &b);
	printf("Enter Operation (1-4) (+,-,x,/)");
	scanf("%d", &calc);

	switch (calc)
	{
	case 1: c = sum(a,b);
		break;
	case 2: c = sub(a,b);
		break;
	case 3: c = multi(a,b);
		break;
	case 4: c = divide(a,b);
		break;
	default: printf("Invalid Character!");
	}

	printf("Result is %e", c);
}

float sum(float x, float y)
{
	float r;
	r = x + y;
	return r;
}
float sub(float x, float y)
{
	float r;
	r = x - y;
	return r;
}
float multi(float x, float y)
{
	float r;
	r = x * y;
	return r;
}
float divide(float x, float y)
{
	float r;
	r = x / y;
	return r;
}