I need to use 0 to quit a program

**cwest** · 12-14-2001

I am trying to finish an array and have every thing done except the program has a requirement to end if the number 0 is typed in.
See program below and advise:

#include <stdio.h>
int main()
{
int idpur [4], sold [4], left [4], i, id, sold1, sold2, sold3, sold4, left1, left2, left3, left4;
printf("Welcome to the Pop4u store!\n");
printf("Please enter the initial number of cases of Coca-Cola: \n");
scanf("%d", &idpur [0]);
printf("Please enter the initial number of cases of Pepsi: \n");
scanf("%d", &idpur [1]);
printf("Please enter the initial number of cases of Dr. Pepper: \n");
scanf("%d", &idpur [2]);
printf("Please enter the initial number of cases of Canada Dry: \n");
scanf("%d", &idpur [3]);

for (i = 1; i > 0; ++i)
{
printf("Please enter the ID number: \n");
printf("1 = Coca-Cola\n");
printf("2 = Pepsi\n");
printf("3 = Dr. Pepper\n");
printf("4 = Canada Dry\n");
printf("0 = Quit\n");
scanf("%d", &id);
if (id == 1)
{
printf("Please enter the qunatity to sell: \n");
scanf("%d", &sold1);
{
if (sold1 > idpur [i])
printf("Not sold! There are only %d cases available.\n", idpur [i]);
else
printf("%d cases are sold and %d cases are left.\n", sold1, left1 = idpur[i] - sold1);
idpur [i] = left1;
}
}
else if (id == 2)
{
printf("Please enter the qunatity to sell: \n");
scanf("%d", &sold2);
{
if (sold2 > idpur [i])
printf("Not sold! There are only %d cases available.\n", idpur [i]);
else
printf("%d cases are sold and %d cases are left.\n", sold2, left2 = idpur[i] - sold2);
idpur [i] = left2;
}
}
else if (id == 3)
{
printf("Please enter the qunatity to sell: \n");
scanf("%d", &sold3);
{
if (sold3 > idpur [i])
printf("Not sold! There are only %d cases available.\n", idpur [i]);
else
printf("%d cases are sold and %d cases are left.\n", sold3, left3 = idpur[i] - sold3);
idpur [i] = left3;
}
}
else if (id == 4)
{
printf("Please enter the qunatity to sell: \n");
scanf("%d", &sold4);
{
if (sold4 > idpur [i])
printf("Not sold! There are only %d cases available.\n", idpur [i]);
else
printf("%d cases are sold and %d cases are left.\n", sold4, left4 = idpur[i] - sold4);
idpur [i] = left4;
}
}
else if (id == 0)
{
printf(" \n");
}
else
{
printf("You have entered ann invalid code!\n");
}
}
printf("Final Counts: \n");
printf("Coca-Cola: %d\n", left1);
printf("Pepsi: %d\n", left2);
printf("Sr. Pepper: %d\n", left3);
printf("Canada Dry: %d\n", left4);

return 0;
}

**quzah** · 12-14-2001

> for (i = 1; i > 0; ++i)

This will likely loop forever because you're incrementing i.

You should really use a switch instead of all of those 'if/else' checks.

switch( id )
{
case 0: ...all done! exit(0); break;
case 1: ...do stuff... break;
case 2: ...do stuff... break;
default: ...bad command... break;

}

Additionally, you could use:

id = getchar( );
getchar( );
switch( id )
{
case '0': ...do stuff...
}

Quzah.

**Sebastiani** · 12-15-2001

I cleaned it up a little, added some basic screen functions, "clrscr()" and "system("PAUSE")", and introduced the "continue" and "break" loop commands. My point is to show you there is an easier way than using all of those "hard-coded" variables.

i hope it helps.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <conio.c> 

int main()
{
int idpur [4];
int sold;     // <--now just one variable

printf("Please enter the initial number of cases of Coca-Cola: \n");
scanf("%d", &idpur [0]);
printf("Please enter the initial number of cases of Pepsi: \n");
scanf("%d", &idpur [1]);
printf("Please enter the initial number of cases of Dr. Pepper: \n");
scanf("%d", &idpur [2]);
printf("Please enter the initial number of cases of Canada Dry: \n");
scanf("%d", &idpur [3]);

while(1)  // <--INFINITE LOOP
{
printf("Please enter the ID number: \n");
printf("1 = Coca-Cola\n");
printf("2 = Pepsi\n");
printf("3 = Dr. Pepper\n");
printf("4 = Canada Dry\n");
printf("0 = Quit\n");

scanf("%d", &id );

if( id == 0 )
break;        // <-- break out of while loop, print totals

else if( id > 4 )
{
printf("You have entered ann invalid code!\n");
continue;   // <-- Go back to the top of while loop
}

i = id - 1; //<-- set "i" to proper array element

printf("Please enter the qunatity to sell: \n");

scanf("%d", &sold );

if( sold > idpur[i] )  //<-- i is equiv to coresponding array element 
{
printf("Not sold! There are only %d cases available.\n", idpur [i]);
}

else
{
idpur[i] = idpur[i] - sold;  // or...// idpur[i] -= sold;
 
printf("%d cases are sold and %d cases are left.\n", sold, idpur[i]);
}



system("PAUSE"); //<-- you need this to pause screen

clrscr();       //<-- you need this to clear the screen

}  //<-- End of infinite loop

clrscr();
printf("Final Counts: \n");
printf("Coca-Cola: %d\n", idpur[0]);
printf("Pepsi: %d\n", idpur[1]);
printf("Sr. Pepper: %d\n", idpur[2]);
printf("Canada Dry: %d\n", idpur[3]);

system("PAUSE");

return 0;
}

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