CODEWITHSUNDEEP
c
user3807592
user3807592

Reputation: 55

Explain example code (c programming)

The code below is from a c programming tutorial book. The purpose is to find the average of 10 floating-point value.

#include <stdio.h>

void avg(double *d, int num);

int main(void)
{
    double nums[]={1.0,2.0,3.0,4.0,5.0,
                   6.0,7.0,8.0,9.0,10.0}

    avg(nums,10);

    return 0;
}

void avg(double *d, int num)
{
    double sum;
    int temp;

    temp=num-1;

    for(sum=0;temp>=0;temp--)
        sum=sum+d[temp];
    printf("Average is %f", sum/(double)num);
}

What happens when d[temp] is used in line 23.

Upvotes: 0

Views: 179

Answers (4)

Sathish
Sathish

Reputation: 3870

sum=sum+d[temp]

Where you are accessing every tempth element of double array d.

If you are having 3 numbers

temp=num-1; // temp =2

for(sum=0;temp>=0;temp--)
    sum=sum+d[temp];

will expand to-

sum=0+d[2]; then temp becomes 1 // you are adding 2nd element with sum
sum=sum+d[1]; then temp becomes 0 // here you are adding with previous result // First element + sum
sum=sum+d[0]; then temp becomes -1 // condition fails // 0th element + sum

It is simply-

sum=d[2]+d[1]+d[0];

Upvotes: 1

Jeegar Patel
Jeegar Patel

Reputation: 27210

In line 23

d[temp] will get the float data of the index with temp in nums array,

In another term d[temp] will replace with the temp + 1 th element of nums array.

Upvotes: 0

mathf
mathf

Reputation: 316

You iterate over your nums[]-Array and on this line, you add all values to your some variable. d[temp] access the value of the item on index temp.

Upvotes: 0

Robert Allan Hennigan Leahy
Robert Allan Hennigan Leahy

Reputation: 6578

d[temp] means to access the tempth element of the array pointed to by d. I.e. d points to an array of at least temp+1 doubles, and you wish to retrieve the tempth of those.

Upvotes: 1

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