what am i doing wrong?

[newbiecr]

im trying to calculate the sum of 1/1 + 1/2+...+1/100

#include <stdio.h>
int main() {
    
    int i;
    
    float res;
    
    res = 0;
    
    for (i=1;i<=100;i++){

        res = res + 1/i;
       
        }

    printf("%f",res);
    
    getchar();
    
    return 0;
    
}

result: 1????????????????????

[Adak]

You're doing integer division, where the remainder is thrown out, so it boils down to 1/1 = 1, and all the other divisions are zero's.

So the answer is just 1.

[newbiecr]

You're doing integer division, where the remainder is thrown out, so it boils down to 1/1 = 1, and all the other divisions are zero's.

So the answer is just 1.

thank you i changed to

#include <stdio.h>
#include <math.h>
int main() {
    
    int i;
    
    float res;
    
    res = 0;
    
    for (i=1;i<=100;i++){

        res = res + 1.0/i;
       
        }

    printf("%f",res);
    
    getchar();
    
    return 0;
    
}

and i think it works now

result: 5.187378

is it correct?

[Kennedy]

Usually, it is best to define the types in the code:

res = res + 1.0f/(float)i;

Though this is not a requirement.

[Elysia]

Only one side needs to be a floating point, though.