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#include <stdio.h>
/* Returns the mean value of the array */
float mean(float array[], int size) {
float total = 0.0;
int i;
for (i = 0; i < size; i++) {
total += array[i];
printf("array[%d] = %f and total is %f\n", i, array[i], total);
}
return total / size;
}
enum {array_size = 10};
float array_value = 10.1;
int main() {
float array[array_size];
float avg;
int i;
for (i = 0; i < array_size; i++) {
array[i] = array_value;
}
avg = mean( array, array_size);
printf("mean is %f\n", avg);
if (avg == array[0]) {
printf("array[0] is the mean\n");
} else {
printf("array[0] is not the mean\n");
}
return 0;
}
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array[0] = 10.100000 and total is 10.100000
array[1] = 10.100000 and total is 20.200001
array[2] = 10.100000 and total is 30.300001
array[3] = 10.100000 and total is 40.400002
array[4] = 10.100000 and total is 50.500000
array[5] = 10.100000 and total is 60.599998
array[6] = 10.100000 and total is 70.699997
array[7] = 10.100000 and total is 80.799995
array[8] = 10.100000 and total is 90.899994
array[9] = 10.100000 and total is 100.999992
mean is 10.099999
array[0] is not the mean
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Compliant Solution
This code may be fixed by replacing the floating-point numbers with integers for the internal computation. Floats are used only when printing results.
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#include <stdio.h>
/* Returns the mean value of the array */
int mean(int array[], int size) {
int total = 0.0;
int i;
for (i = 0; i < size; i++) {
total += array[i];
printf("array[%d] = %f and total is %f\n", i, array[i] / 100.0, total / 100.0);
}
return total / size;
}
enum {array_size = 10};
int array_value = 1010;
int main() {
int array[array_size];
int avg;
int i;
for (i = 0; i < array_size; i++) {
array[i] = array_value;
}
avg = mean( array, array_size);
printf("mean is %f\n", avg / 100.0);
if (avg == array[0]) {
printf("array[0] is the mean\n");
} else {
printf("array[0] is not the mean\n");
}
return 0;
}
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Compliant Solution
This code may be fixed by replacing the floating-point numbers with integers for the internal computation. Floats are used only when printing results.
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| bgColor | #ccccff
On a 64-bit Linux machine using gcc 4.1, this program yields the following output, which is what we expect:
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