A function that returns the mean and sum of elements.

I would like to output the average and sum of the elements from 0th to n-1, but I don't know how to do it.
I think I understand how to write programs like 1+2+3+4+...+n, but I didn't know how to write programs that let the terminal input numbers randomly and output the sum and mean.
I entered the program as follows, but I probably thought the sumIntArray part was wrong, and I didn't know what to program in /......../.

void readIntArray (inta[], int size)
{
    inti;
    for(i=0;i<size;i=i+1){
        printf("%dth?", i=i+1);
        scanf("%d", & a[i]);
    }
    printf("%d", a[i]);
}

void sumIntArray(inta[], int size)
{
int sum, i;
for(i=0;i<size;i=i+1){
sum = sum + i;
}
return sum;
}

int main (void)
{
  int data [100], n, sum;
  double average;

  printf("n=? ");
  scanf("%d", & n);

  readIntArray(data,n);

  sum=sumIntArray(data,n);
  printf("sum=%d\n",sum);

/......................./
  return 0;
}

The example execution should be as follows:

$./a.out
n = ?5
0th? 2nd.
1st? 3
2nd? 5
Number three? Number seven.
4th? 11
sum = 28
average=5.600000

2022-09-30 14:08

1 Answers

Review the program based on the following:

Previous question Same as @metropolis's comment on about storing elements in reverse order
printf("%dth?",i=i+1); in the readIntArray() function is printf("%dth?",i+1);
readIntArray()The last printf("%d", a[i]) of the function does not make sense
sumIntArray()Function definition and processing incorrectly
- Return value is not void but int
- The variable sum has not been initialized to 0
- forModify the processing in the loop to add index values to add data
doubleCast the total value and the number of data in double to get the average expressed by the value
double To specify how to display the value in printf(), view your reference book or search the web

Return value is not void but int
The variable sum has not been initialized to 0
forModify the processing in the loop to add index values to add data

2022-09-30 14:08

If you have any answers or tips

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