I'm currently trying to create a small program that gets the user to enter 5 values, which are then saved in an array, and then the program calculates the average and displays it.

Here is what I have so far, it works as far as getting the user to enter the values however I have no idea how to get it to find out the sum of the values and then calculate the average. I have put in what I thought it should be but it is throwing up the following errors when I compile it.

'+' : pointer addition requires integral operand
'=' : cannot convert from 'float' to 'int (__cdecl *)(const char *,...)'

Can somebody please point me in the direction of a solution.

Thanks very much.

``````#include <stdio.h>

int main()
{
char str;
int i;
float sum;
float average;

for (i=0;i<5;i++)
{
printf("\nEnter value %d:",i+1);
fgets(str[i],20,stdin);
}

printf("Item # - Value");

for(i=0;i<5;i++)
{
printf("\n%d\t - %s",i+1,str[i]);
}
//problem start
for(i=0;i<5;i++)
{
sum = sum + str[i];
}

average = sum/5;
printf=("%f",average);
//problem end
return 0;
}``````

You are inputting strings and you want the average of them? I guess first you need to explain this:

What is the average of "John", "Book", "Table", "Sheila" and "Europe"?

Answer that, and we can understand what you need...

Your code doesn't make sense. Why are you using fgets() on floats? Try setting up like this.

``````#include <stdio.h>

#define ARR_SIZE 5

int main()
{
float nums[ARR_SIZE];
int i = 0;

for ( i = 0; i < ARR_SIZE; i++ )
{
printf("\nEnter value %d:", i + …``````

## All 5 Replies

You are inputting strings and you want the average of them? I guess first you need to explain this:

What is the average of "John", "Book", "Table", "Sheila" and "Europe"?

Answer that, and we can understand what you need...

Sorry, was being retarded. I copied the first few lines from an old project and didn't check that.

The code below should be less retarded but it is showing an error on line 27, saying:

'+' : pointer addition requires integral operand

As far as I can tell I have used floats for the inputs into the array, the sum and the average, which should allow it to work. I have no idea what is wrong now.

``````#include <stdio.h>

int main()
{
float str;
int i;
float sum;
float average;

for (i=0;i<5;i++)
{
printf("\nEnter the weight of person %f:",i+1);
fgets(str[i],20,stdin);
}

printf("Person # - Weight");

for(i=0;i<5;i++)
{
printf("\n%d\t - %f",i+1,str[i]);
}

for(i=0;i<5;i++)
{
sum = sum + str[i];
}

average = sum/5;
printf("%f",average);

return 0;
}``````

I have changed the data types so they are uniform all the way through, so the initial input is being read as a float and when it is being used in the sums towards the end it is read as a float, but it still isn't working.

The main problem area is the large comment towards the bottom. One more possible problem is with the displaying of the values. Where I have put the first comment, if I tell it to print a float then every row simply comes out as 0.00000000, it only works if I define is as a string. Is this a problem?

The code currently looks as follows:

``````#include <stdio.h>

int main()
{
float str;
int i;
float sum;
float average;

for (i=0;i<5;i++)
{
printf("\nEnter value %d:",i+1);
fgets(str[i],20,stdin);
}

printf("Item # - Value");

for(i=0;i<5;i++)
{
printf("\n%d\t - %s",i+1,str[i]);//is it OK to use %s here?
}

/*for(i=0;i<5;i++)
{
sum = sum + str[i];
}

average = sum/5;
printf=("%f",average);
*/
return 0;
}``````

Thanks for any help.

Your code doesn't make sense. Why are you using fgets() on floats? Try setting up like this.

``````#include <stdio.h>

#define ARR_SIZE 5

int main()
{
float nums[ARR_SIZE];
int i = 0;

for ( i = 0; i < ARR_SIZE; i++ )
{
printf("\nEnter value %d:", i + 1);
fscanf(stdin, "%f", &nums[i]);
}

for(i = 0; i < ARR_SIZE; i++)
{
printf("%d - %f\n",(i + 1), nums[i]);
}

return 0;
}``````

hey buddy i wont help you much .. coz iam learning c as well i know is kinda hard but you should clean up your code .. make you variable name clear , its confusing , also fgets???? -thats for string dunno if that works for integers .. i recommend you to use scanf command, also dont forget your & ,
Well maybe you should try something easier for beginning try it with single array , here is a HINT for you
n stands for ary you want to work with
for(i=0,i=total;i<n;i++)
total=total+n
printf ("avearge is %d", total/i)

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts learning and sharing knowledge.