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

void getNumSum( float &aSum )

{

float data = 0.0;

// ask user for float here...

 

aSum += data;

}

Edited October 27, 201312 yr by Sensei

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;

}

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, 201312 yr by Sensei

Error occurs when compiler

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, 201312 yr by Sensei

Show you my result

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

The same Sorry to disturb you

You named file .c

but it's .cpp code

Could you write it in .c

References are in cpp, not in old c.

Rename file and should be fine.

Edited October 28, 201312 yr by Sensei

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

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 );
}
}

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

Mine code is for loop 5 times, not 3.

And text displayed to user is different.

fSum instead of aSum as name.