Need help for C programme

[Rocky2013]

a) Write a function, named getNumSum(), for accumulating(summing)float numbers:

->The function has no return value

->The function has 1 input argument named aSum: the current accumulative sum to be "updated" inside this function(Hint: use pass by reference)

->The function asks user for a float input, then updates the accumulative sum

->No code for input validation needed

[Sensei]

void getNumSum( float &aSum )

{

float data = 0.0;

// ask user for float here...

 

aSum += data;

}

Edited October 27, 2013 by Sensei

[Rocky2013]

Thanks but it is not work

You means

 

#include<stdio.h>

void getNumSum( float aSum );

int main()

{

float aSum;

float data = 0.0;

printf("Please input a float number: ");

scanf("%f", &aSum);

aSum += data;

}

[Sensei]

Rather something like this:

 

#include <stdio.h>

 

void getNumSum( float &aSum ) // do you see difference here?? Parameter must be with &

{

float data = 0.0;

printf("Please input a float number: ");

scanf("%f", &data );

 

aSum += data;

}

 

void main()

{

float aSum = 0.0;

for( int i = 0; i < 5; i++ )

{

getNumSum( aSum );

printf( "Sum %f\n", aSum );

}

}

Edited October 28, 2013 by Sensei

[Rocky2013]

Error occurs when compiler

[Sensei]

Can't you simply copy and paste to compiler what I wrote in post #4?

This time I have compiled above code, and tested and worked as intended...

Edited October 28, 2013 by Sensei

[Rocky2013]

Show you my result

[Sensei]

It's not exactly what I posted in #4. Compare lines one by one..

[Rocky2013]

The same Sorry to disturb you

[Sensei]

You named file .c

but it's .cpp code

[Rocky2013]

Could you write it in .c

[Sensei]

References are in cpp, not in old c.

Rename file and should be fine.

Edited October 28, 2013 by Sensei

[Rocky2013]

Teacher ask me finishing this lab in c programme so could you teach me how to achieve the above target in c programme, Please

[Sensei]

Then your teacher is incompetent..

Because it's in flagrant conflict with this "(Hint: use pass by reference)"...

 

In ANSI C, you have to replace references by pointers.

 

#include <stdio.h>

void getNumSum( float *aSum )
{
float data = 0.0;
printf("Please input a float number: ");
scanf("%f", &data );

*aSum += data;
}

void main()
{
float aSum = 0.0;
for( int i = 0; i < 5; i++ )
{
getNumSum( &aSum );
printf( "Sum %f\n", aSum );
}
}

[Rocky2013]

What is the difference between the above lab and the lab show you below.

[Sensei]

Mine code is for loop 5 times, not 3.

And text displayed to user is different.

fSum instead of aSum as name.