Write a program to find the weighted average of a collection of numbers

Source Code

 #include <stdio.h>

 int main()

 {

     float value, weight, sum = 0;

     int index = 0;

     char str[10];

     printf("Calculation of weighted average\n");

     do {

         printf("enter value : ");

         scanf ("%f", &value);

         printf("enter weight in fraction : ");

         scanf ("%f", &weight);

         printf("effective value : %f considered.\n", value * weight);

         sum += value * weight;

         index++;

         printf("current sum : %f and counts : %d\n", sum, index);

         printf("Do you want to enter another value? ");

         scanf ("%s", str);

     } while(tolower(str[0]) == 'y');

     sum /= index;

     printf("weighted average = %f\n", sum);

     return 0;

 }

Output

 Calculation of weighted average

 enter value : 1

 enter weight in fraction : 1.0

 effective value : 1.000000 considered.

 current sum : 1.000000 and counts : 1

 Do you want to enter another value? yes

 enter value : 2

 enter weight in fraction : 0.5

 effective value : 1.000000 considered.

 current sum : 2.000000 and counts : 2

 Do you want to enter another value? yes

 enter value : 3

 enter weight in fraction : 0.5

 effective value : 1.500000 considered.

 current sum : 3.500000 and counts : 3

 Do you want to enter another value? no

 weighted average = 1.166667

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