#include
int main(void) {
int a, b;
char ch;
printf("Do you want to (Enter first letter):\n");
printf("(A)dd, (S)ubtract, (M)ultiply, or (D)ivide?\n");
do {
printf("Your choice: ");
ch = getchar();
} while(ch!='A' && ch!='S' && ch!='M' && ch!='D');
printf("\n");
printf("Enter first number: ");
scanf("%d", &a);
printf("Enter second number: ");
scanf("%d", &b);
switch(ch) {
case 'A': printf("%d", a + b);
break;
case 'S': printf("%d", a - b);
break;
case 'M': printf("%d", a * b);
break;
case 'D': if(b!=0) printf("%d", a / b);
}
return 0;
}