Sunday assignment calculator, C (gcc)

Language: Layout:

//gcc 5.4.0

#include  <stdio.h>

int main(void)
{
        int numberOne;
        int numberTwo;
        int operation;
        int answer;
    printf("Please enter two numbers\n");
    scanf("%d", &numberOne);
    scanf("%d", &numberTwo);
    printf("Please enter the number in accordance with the operation you would like to use on the two numbers entered.\n");
    printf(" If addition enter 1\n If subtraction enter 2\n if multiplication enter 3\n if division enter 4\n");
    scanf("%d", &operation);
           if (operation==1) {
               (answer=numberOne + numberTwo);
               printf("%d", answer);
           } 
           else if (operation==2) {
               (answer=numberOne - numberTwo);
               printf("%d", answer);
           }
           else if (operation==3) {
               (answer=numberOne / numberTwo);
               printf("%d", answer);
           }
           else if (operation==4) {
               (answer=numberOne * numberTwo);
               printf("%d", answer);
           } 
    return 0;
}

Show compiler warnings [ + ] Compiler args [ - ] Show input
Compilation time: 0.13 sec, absolute running time: 0.13 sec, cpu time: 0.04 sec, memory peak: 3 Mb, absolute service time: 0,35 sec