/* A simple calculator which calls
function to do operations*/
#include <stdio.h>
#include <conio.h>
/*declaring function*/
float add(float,float);
float sub(float,float);
float mult(float,float);
float div(float,float);
int main()
{
char exit = ' ';
do
{
float dig1 = 0 , dig2 = 0 ;
char opert;
printf("Please enter first digit:
");
scanf("%f",&dig1);
printf("\n\nNow enter operation to
perform: ");
scanf("%c",&opert);
opert=getche();
/*if operation is division then implementing
cheks and conditions to stop entering denominator as zero*/
if (opert=='/')
{
while(dig2 == 0)
{
printf("\n\n\nNow enter 2nd the digit:
");
scanf("%f",&dig2);
if(dig2==0)
{
printf("\tWarning!\nDenominator can not be zero.");
}
}
}
else
{
printf("\n\n\nNow enter 2nd the digit:
");
scanf("%f",&dig2);
}
/*Checking operation and calling function related to
operation*/
switch (opert)
{
case '+':
add(dig1,dig2);
break;
case '-':
sub(dig1,dig2);
break;
case '*':
mult(dig1,dig2);
break;
case '/':
div(dig1,dig2);
break;
default :
printf("\t\n\nWarning!\n Wrong
operation entered.");
}
exit = ' ';
/*To continue or exit*/
while(exit !='e'
&& exit != 'c' && exit !='E' && exit != 'C')
{
printf("\n\nEnter 'e' to exit or 'c' to
continue using program: ");
scanf("%c",&exit);
exit = getche();
printf("\n\n");
}
}
while (exit != 'e'
&& exit != 'E');
getche();
return 0;
}
/*Defining functions*/
/*addition function*/
float add(float digi1add, float digi2add )
{
printf("\n\n%f + %f = %f\n\n\n",digi1add,
digi2add, digi1add + digi2add);
}
/*subtraction function*/
float sub(float digi1sub, float digi2sub )
{
printf("\n\n%f - %f = %f\n\n\n",digi1sub,
digi2sub, digi1sub - digi2sub);
}
/*multiplication function*/
float mult(float digi1mul, float digi2mult )
{
printf("\n\n%f x %f = %f\n\n\n",digi1mul,
digi2mult, digi1mul * digi2mult );
}
/*division function*/
float div(float digi1div, float digi2div )
{
printf("\n\n%f / %f = %f\n\n\n",digi1div,
digi2div, digi1div / digi2div);
}
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