This C program is simple calculator with basic operations : adding (+), subtracting (-), multiplying (*) and dividing (/). You first need to enter two numbers and then choose operation and then you will get result. Choosing operation is done by pressing +,-,* or /, if you press anything else you will get error message Non existing operation! (Nepostojeca operacija!).

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/* opis: kalkulator autor: Milko Leporis datum: 1.11.2005 */ #include <stdio.h> int main() { int a, b; char odg, op, c; do { printf("\n\nUnesite prvi operand: "); scanf("%d",&a); c = getchar(); printf("\nUnesite drugi operand: "); scanf("%d",&b); c = getchar(); printf("\nIzaberite operaciju ( + - * / ): "); op = getchar(); switch (op) { case '+': printf("\n\tRezultat: %d + %d = %d\n\n",a, b, a + b); break; case '-': printf("\n\tRezultat: %d - %d = %d\n\n",a, b, a - b); break; case '*': printf("\n\tRezultat: %d * %d = %d\n\n",a, b, a * b); break; case '/': if(b == 0) printf("\n\tDeljenje sa 0 nije definisano!\n\n"); else printf("\n\tRezultat: %d / %d = %d\n\n",a, b, a / b); break; default: printf("\n\tNepostojeca operacija!"); break; } printf("\n\nDa li zelite da ponovite unos? (d) "); odg = getchar(); odg = getchar(); } while (odg == 'd'); return 0; }