Question

I am using C and I have an array t[]

I wrote a for loop but the answer is wrong.

Please help me catch the error. My code is:

for(j = 0; j < tags; j++)
{
    for(k = j; k < nb_of_subscribers*tags; k = k+tags)
    {
        avr[j] = (float)(avr[j]+t[k]);
    }
    printf("avr[j]:%f", avr[j]);
}

Actually , the values of t[] are read incorrectly in the for loop i don’t know why . If i use a for loop only to printf the values of the array t the response is correct otherwise(in the for loop)it is incorrect

Thank you.

Answer 1

You should set avr[j] to 0 before starting your iterative sum:

for(j = 0; j < tags; j++)
{
    avr[j] = 0; // <-----
    for(k = j; k < nb_of_subscribers*tags; k = k+tags)
    {
        avr[j] = (float)(avr[j]+t[k]);
    }
    printf("avr[j]:%f", avr[j]);
}