This is the result after I run the code

it’s only appear the n2 instead of the sum of n1+n2

#include <stdio.h>
int main()
{
    char op,n1,n2;
    printf("Enter the operation: ");
    scanf("%c",&op);

    switch(op)
    {
        case '+':
            printf("Enter the number: ");
            scanf("%d %d",&n1,&n2);
            printf("result = %d ",n1+n2);
            break;
        case '-':
            printf("result = %d ",n1-n2);
            break;
        case '*':
            printf("result = %d ",n1*n2);
            break;
        case '/':
            printf("result = %d ",n1/n2);
            break;
        default:
            printf("Error: unknown operator!");
            break;
    }
return(0);
}

Is there a way to fix this issue or alternative way?