void pointer and Casting

Code

#include <stdio.h>

void add_and_print(void *a, void *b, char type) {
    // Write your logic here using type casting
    if(type=='f'){
        printf("%.1f",(*(float*)a)+(*(float*)b));
    }
    else if(type=='i'){
         printf("%d",*(int*)a+*(int*)b);
    }
}

int main() {
    char type;
    scanf(" %c", &type);

    if (type == 'i') {
        int x, y;
        scanf("%d %d", &x, &y);
        add_and_print(&x, &y, type);
    } else if (type == 'f') {
        float x, y;
        scanf("%f %f", &x, &y);
        add_and_print(&x, &y, type);
    }

    return 0;
}

Solving Approach

TYPE CASTING SYNTAX is important first typecast the pointer , then use dereference operator 

i.e *((datatype_ptr*)ptr_name) example *(char*)ptr