Circle A&R

#include <stdio.h>
int main(){
    float pie = 3.1415;
    float radius;
    int op;
    printf("Enter 1 to calc circumference, 2 to calc area\n");
    scanf_s("%d", &op);
    if (op == 1){
        printf("enter the Radius\n");
        scanf_s("%fl", &radius);
        float circ = 2 * pie * radius;
        printf ("circumference: %fl\n", circ);
    }
    else if (op == 2){
        printf("Enter the Radius\n");
        scanf_s("%fl", &radius);
        float area = pie * radius * radius;
        printf("Area: %fl\n", area);
    }
    else if(op != 1 && op != 2){
        printf("operation invalid\n");
        return 0;
    }

    return 0;
}