## Sunday, September 03, 2006

### Calculation of Sum, Average and Standard Deviation using Functions and Pointers.

Write a function that receives 5 integers and returns the sum, average and standard
deviation of these numbers. Call this function from main() and print the results in main().

#include<stdio.h>
#include<math.h>

int calc (float a, float b, float c, float d, float e, float *sum, float *avg,float *sd);

int main()
{
float a, b, c, d, e, sum=0.0, avg=0.0;

float sd=0.0;

printf("Enter Five Numbers:");
scanf("%f %f %f %f %f",&a,&b,&c,&d,&e);

calc (a, b, c, d, e, &sum, &amp;avg, &sd);

printf("\nSum=%f", sum);
printf("\nAverage=%f", avg);

printf("\nStandard Deviation=%f\n", sd);

getchar();

return 0;
}

calc (float a, float b, float c, float d, float e, float *sum, float *avg, float *sd)

{
float Calc=0.0;

*sum = a+b+c+d+e;

*avg = *sum / 5.0;

Calc += ( a - *avg) * ( a - *avg);

Calc += ( b - *avg) * ( b - *avg);

Calc += ( c - *avg) * ( c - *avg);
Calc += ( d - *avg) * ( d - *avg);

Calc += ( e - *avg) * ( e - *avg);

*sd = sqrt((double)Calc/5.0);

}

Notes for calculation of Standard Deviation:
http://es.wikipedia.org/wiki/Standard_deviation

The program can be found at:

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Ali B said...

SUM (sum), AVG (average), MIN (minimum), MAX (maximum), STDEV (standard deviation), VAR (variance) are implemented here:

http://mycodelog.com/2010/03/27/c-aggregates/

jamilaawan said...

i cant understand it please explain it

jamilaawan said...

when this program was run then output of sum,average and standard deviation all are zero...how can i correct this error?