Thread: need help

i need help with starting a problem that i have to do for class, you dont have to give me any code just could anyone help me on how to outline how to do it, possibly? I'm just confused i'm new with arrays and i know some about them but i dont know how to tackle this problem, any help would be appreciated thanks,

here's the assignment: http://userpages.umbc.edu/~macneil/cmsc104/lab8.txt

ok here's what i've done:

Code:

#include <stdio.h>
#define SIZE 8

void printMenu();

int main()
{
    int i=0, j=0;
    char choice[80];
    int array[SIZE];

    for(i=0;i<SIZE;i++)
      {
          printf( "%d Enter a number: ", i );
          scanf( "%d", &array[i] );
      }

    printf( "\nThe Contents of the Array are:\n " );

    for(j=0;j<SIZE;j++)
      {
        printf( "%4d", array[j] );
      }

    printMenu();

    printf( "Enter a Choice: " );
    scanf( "%s", choice );




}


void printMenu()
{
    printf( "\n\n ** Menu **\n\n" );
    printf( "1. * \n" );
    printf( "2. / \n" );
    printf( "3. + \n" );
    printf( "4. - \n" );
    printf( "5. = \n" );
    printf( "6. % \n" );
    printf( "7. Swap \n" );
    printf( "8. Drop \n" );
    printf( "9. Clear \n" );
    printf( "10. Quit \n\n" );
}

i need to know how to go to different functions whether the user enters one of the numbers, but more important if they enter a choice like "Swap", what would the syntax look like for a switch statement for something like this or if statements, just so whatever they enter will take them to the appropriate function that i'll write later. Thanks any help in advance.

here's the assignment: http://userpages.umbc.edu/~macneil/cmsc104/lab8.txt


and here's what i've done:

Code:

#include <stdio.h>
#define SIZE 8

void printMenu();

int main()
{
    int i=0, j=0;
    char choice[80];
    int array[SIZE];

    for(i=0;i<SIZE;i++)
      {
          printf( "%d Enter a number: ", i );
          scanf( "%d", &array[i] );
      }

    printf( "\nThe Contents of the Array are:\n " );

    for(j=0;j<SIZE;j++)
      {
        printf( "%4d", array[j] );
      }

    printMenu();

    printf( "Enter a Choice: " );
    scanf( "%s", choice );




}


void printMenu()
{
    printf( "\n\n ** Menu **\n\n" );
    printf( "1. * \n" );
    printf( "2. / \n" );
    printf( "3. + \n" );
    printf( "4. - \n" );
    printf( "5. = \n" );
    printf( "6. % \n" );
    printf( "7. Swap \n" );
    printf( "8. Drop \n" );
    printf( "9. Clear \n" );
    printf( "10. Quit \n\n" );
}

i need to know how to go to different functions whether the user enters one of the numbers, but more important if they enter a choice like "Swap", what would the syntax look like for a switch statement for something like this or if statements, just so whatever they enter will take them to the appropriate function that i'll write later. Thanks any help in advance.

A part of the solution

You can write a separte swap function:

Code:

void swap(int &a, int &b)
{
int temp = a;
a = b;
b =  temp;
}

something like that...
then you can call this function
when

Code:

case '7': 
swap(array[secondlast], array[last]);

ok now i'm here can anyone help me by showing me maybe what i should put into the functions themselves? i'm kinda stuck, help would be appreciated thanks,

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SIZE 8

void printMenu();
void multiply(int [], int);
void divide(int [], int);
void add(int [], int);
void sub(int [], int);
void copy(int [], int);
void remainder(int [], int);
void swap(int [], int);
void drop(int [], int);
void clear(int [], int);

int main()
{
    int i=0, j=0;
    char choice[80];
    int array[SIZE];

    for(i=0;i<SIZE;i++)
      {
          printf( "%d Enter a number: ", i );
          scanf( "%d", &array[i] );
      }

    printf( "\nThe Contents of the Array are:\n " );

    for(j=0;j<SIZE;j++)
      {
        printf( "%4d", array[j] );
      }

    printMenu();

    printf( "Enter a Choice: " );
    scanf( "%s", choice );

    if((choice[0] == '1') || (choice[0] == '*'))
      {
          multiply( array, SIZE );
      }
    if((choice[0] == '2') || (choice[0] == '/'))
      {
          divide( array, SIZE );
      }
    if((choice[0] == '3') || (choice[0] == '+'))
      {
          add( array, SIZE );
      }
    if((choice[0] == '4') || (choice[0] == '-'))
      {
          sub( array, SIZE );
      }
    if((choice[0] == '5') || (choice[0] == '='))
      {
          copy( array, SIZE );
      }
    if((choice[0] == '6') || (choice[0] == '%'))
      {
          remainder( array, SIZE );
      }
    if((strcmp(choice, "7") == 0) || (strcmp(choice, "Swap") == 0))
      {
          swap( array, SIZE );
      }
    if((strcmp(choice, "8") == 0) || (strcmp(choice, "Drop") == 0))
      {
          drop( array, SIZE );
      }
    if((strcmp(choice, "9") == 0) || (strcmp(choice, "Clear") == 0))
      {
          clear( array, SIZE );
      }
    if((strcmp(choice, "10") == 0) || (strcmp(choice, "Quit") == 0))
      {
          exit(0);
      }
}


void printMenu()
{
    printf( "\n\n ** Menu **\n\n" );
    printf( "1. * \n" );
    printf( "2. / \n" );
    printf( "3. + \n" );
    printf( "4. - \n" );
    printf( "5. = \n" );
    printf( "6. % \n" );
    printf( "7. Swap \n" );
    printf( "8. Drop \n" );
    printf( "9. Clear \n" );
    printf( "10. Quit \n\n" );
}


void multiply( int b[], int size )
{
    int n;

    for(n=0; n < size; n++)
      {
        if((b[n] == '0') || (n == 7)
        {

        }
      }
}

void divide( int b[], int size )
{

}

void add( int b[], int size )
{

}

void sub( int b[], int size )
{

}

void copy( int b[], int size )
{

}

void remainder( int b[], int size )
{

}

void swap( int b[], int size )
{

}

void drop( int b[], int size )
{

}

void clear( int b[], int size )
{

}