Need Help With C++

Twincat SG

So in what situation will you get a solution with 1#inf ?

give you a clue where the logical fault might be :

Total=J[80];

for( I = 0; I < InputBuffer; I++ ) <- how many times do you think it have run?

Total /= Numbers[I];

you need to learn a few tricks in debuging...

Total=J[80];

for( I = 0; I < InputBuffer; I++ )

{

printf (" I = %d , Numbers[%d] =%f ",I,I, Numbers[I]); <--you could use this or use break point features to debug

Total /= Numbers[I];

}

Proskyslayer SG

hahas seriously idk where should i start to debug >.<

er.. every divide there is a error

how many times it will run? << basically between 1-80[letting the user to input]

i uses printf (" I = %d , Numbers[%d] =%f ",I,I, Numbers[I]); as in not good with break.

i tried but to no avail >.<

giv me some hints thanks :)

Twincat SG

1.#inf means that there is something getting divide by zero....you know wht happen when numbers get divided by zero?

printf (" I = %d , Numbers[%d] =%f ",I,I, Numbers[I]);

the above statement does not solve anything but it is your 2nd clue...

it is trying to print to screen what you are dividing in the variables...

you should notice why there is Numbers[2] (on the last printout) in that loop and also feel odd about its value...

how many times it will run? << basically between 1-80[letting the user to input] <-- this is what you think...is that what you tell the pc to do?

Proskyslayer SG

ok i guess i know where is the problem

Proskyslayer SG

after the printf(" ");

The for -loop which have a inputBuffer of -1 should be remove

instead it should be put @ the top b4 the for -loop izzit correct to said it?

This is the new written programme pls take a look :)

#include <stdio.h>

#include <stdlib.h>

int main(void)

{

float *Numbers = NULL, BiggestNum = 0,Total, J[81];

int InputBuffer, I;

{

printf("Please Enter How Many Number You Want to subtract(1~80): ");

scanf(" %d", &InputBuffer);

} while( ( InputBuffer < 1 ) || ( InputBuffer > 80 ) );

Numbers = ( ( float * )calloc( InputBuffer, sizeof( float ) ) );

if( Numbers == NULL )

{

printf( "Failed to allocate the array. Exiting" );

system("pause");

return 1;

}

printf( "Enter number 1: ");

scanf( " %f", &J[80] );

printf( " ");

InputBuffer = InputBuffer -1;

for( I = 0; I < InputBuffer; I++ )

{

printf( "Enter number %d: ", I+2 );

scanf( "%f", &Numbers[I] );

}

Total=J[80];

for( I = 0; I < InputBuffer; I++ )

{

printf (" I = %d , Numbers[%d] =%f ",I,I, Numbers[I]);
Total /= Numbers[I];

}

printf( " Sum of the numbers entered is: %g ", Total );

getchar();

system("pause");

return 0;

}

Goldmonster SG

#include <iostream>

using namespace std;

int main (int argc, char * const argv[]) {

    int count = 0;

    do {
        cout << "How many numbers will you be using? : ";
        cin >> count;
    } while (count <= 0);
    /* Continue prompting until a positive number is entered */

    float numbers[count]; //Create an array of float with size of count

    for (int i=0; i<count; i++) {
        cout << "Enter number #" << (i+1) << ": ";
        cin >> numbers[i];
    }
    /* Fill the float array with numbers according to count */

    float result = numbers[0]; //Set the result to the first number of the array which is number #1
    for(int x=1; x<=count-1; x++)
    {
        result += numbers[x];
    }
    cout << "Addition result: " << result << endl;

    result = numbers[0]; //Reset back result to the first number of the array which is number #1
    for(int x=1; x<=count-1; x++)
    {
        result -= numbers[x];
    }
    cout << "Subtraction result: " << result << endl;

    result = numbers[0];
    for(int x=1; x<=count-1; x++)
    {
        result /= numbers[x];
    }
    cout << "Division result: " << result << endl;

    return 0;
}

Twincat SG

To Proskyslayer:

Ah , very good...your code should work :)

take note : calloc (amount of this variables, sizeof(variable)) returns (pointer with no type a.k.a void)*

remember to use sizeof (variable) to measure the amount of memory space needed to store the variable properly.

For debugging...

1. when you compile, look at the error code (if there is) and try to understand what it is telling you...

2. if the output is not what you expect...insert printf statement to list your variables. and try to work it out step by step...

optimise solution...

you can download the file from here http://www.4shared.com/file/qJHtrGQ5/testing.html

#include <stdlib.h>

{

float *Numbers=NULL ; // defines a pointer which will point to an array later

int InputBuffer, I;

/* ask user for the amount of number to operate on */

{

printf("Please Enter How Many Number You Want to subtract(1 to 80): ");

scanf(" %d", &InputBuffer);

} while( ( InputBuffer < 1 ) || ( InputBuffer > 80 ) );

/* allocate actual memory space as an array base on user input and have the pointer points to it */

Numbers = ((float*)calloc(InputBuffer+1, sizeof(float))); // stores the amount from user plus 1 more for operative

if( Numbers == NULL )

{

printf( "You have not enough RAM and I don't care...bye bye :p " ); // just my random text...

system("pause");

return 1;

}

/* Ask user for numbers to be operated */

for( I = 0; I < InputBuffer; I++ )

{

printf( "Enter number %d: ", I+1 );

scanf(" %f", &Numbers[I]); // store all input to the front of the array

}

/* The operative process */

Numbers[InputBuffer+1]=Numbers[0]; // load first number to the end of initialised array and operate from there

for( I = 1; I < InputBuffer; I++ )

Numbers[InputBuffer+1] -= Numbers[I];

/* Presentation of the equations */

printf(" %g" , Numbers[0]); // display first number in the equation

for( I = 1; I < InputBuffer; I++ ) // display subseqence numbers in the equation

{

if (Numbers[I]<0)

printf( "-(%g)", Numbers[I] ); // better presentation of minus by a negative number

else

printf( "-%g", Numbers[I] );

}

printf( "=%g ", Numbers[InputBuffer+1] ); // display final result in the equation

system("pause");

return 0;

}

Twincat SG

you sure your code is acceptable for all version of c++ compiler? :)

Proskyslayer SG

Thanks for all ur helps :) :))

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