Calculator in C

wel achieving what you intend is not exactly impossible but it is a rather cumbersome task…

for gui look alike you can use boarders and alignment made of //”‘:_-+*# but you eill still have to manually enter the input from keyboard

now for your arithmetic operations it is simpler to use only 2 numbers and one operator or multiple inputs but same operator….or you can try

• using the getchar() function to read
• compare the input character using ascii value to know whether it is an operand or an operator.
• store the operands and operators in two diff arrays
  (store operands as integers ie, 1,2,3etc and operators as the ascii value).
• then do the calculations for the operators with corresponding operands.

but this all may result in magic number errors so i suggest you avoid that

you can stick with a simpler calculator as i have said at the beginning of this answer

below is example of a simple calculator using switch case:

#include <stdio.h>

int main() {

char op;
double first, second;
printf("Enter an operator (+, -, *, /): ");
scanf("%c", &op);
printf("Enter two operands: ");
scanf("%lf %lf", &first, &second);

//using %.1lf to limit input with only one place decimal value
switch (op) {
case '+':
printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf", first, second, first / second);
break;
// operator doesn't match any case constant
default:
printf("Error! operator is not correct");
}

return 0;
}