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12638258
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2012-09-28T10:27:59.177
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2012-09-28T10:27:59.177
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If you don't want to dynamically size the array, another approach is to allocate an array with MAXSIZE elements, where MAXSIZE is "big enough". Also, some other comments: You declared at the top of your program a character array of size 1: <pre><code>char cont[] = { 'y' }; </code></pre> But in your scanf line later you try to use this: <pre><code>s("%s", &cont[0]); </code></pre> This will overflow your buffer even if the user types just one character, because %s assumes that the buffer has at least two bytes available, one for the character and one for the '\0'. Possible fix: <pre><code>char cont[] = { 'y', '\0' }; // ... s("%1s", cont); </code></pre> Note that cont is the same and more common way of saying &cont[0]. Another problem is with things that might be caught by the compiler if warnings are turned on: all functions should be prototyped before they are mentioned, functions without explicit return type should be declared with type int, and you should not let a function drop off without returning a value even though you declared it to explicitly or implicitly. Also, '(' and ')' do not need to be escaped in string literals. Here is a modified version with changes noted. I have redefined clrscr() because I don't have conio.h on this system: <pre><code>#include <stdio.h> #include <ctype.h> // #include <conio.h> #define clrscr() printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n") #include <string.h> #include <stdlib.h> #include <stdbool.h> #define p printf #define s scanf #define MAXSIZE 500 // prototypes [Changed] int pop(); void push(int b); int pick(); int view(); int top; int ar[MAXSIZE]; int size; int main() { int opt, num; char cont[] = { 'y', '\0' }; // [Changed] clrscr(); p("Stacking Program\n\n"); // keep asking until we get a valid size [Changed] for (;;) { p("Data Size: "); s("%d", &size); if (size > 0 && size < MAXSIZE) break; printf("Not a valid size!\n"); } p("\n"); while((cont[0] == 'y') || (cont[0] == 'Y')) { clrscr(); p("Stacking Program"); p("\n\nData Size: %d\n\n", size); p("MAIN MENU\n1. Pop\n2. Push\n3. Pick\n4. View\nChoose: "); s("%d", &opt); p("\n"); switch(opt) { case 1: pop(); break; case 2: if(top > size) { p("You can't push more data"); } else { p("Enter data for Data[%d]: ", top); s("%d", &num); push(num); } break; case 3: pick(); break; case 4: view(); break; default: p("Your choice is not in the list."); break; } p("\n\nDo you want continue(Y/N)?"); s("%1s", cont); // [Changed] } return 0; } int pop() { int a; if(top == 0) // [Changed] { p("Stack empty."); return 0; } else { top--; // [Changed] a = ar[top]; p("(Data[%d] = %d) removed.", top, a); return a; // [Changed] } } void push(int b) { ar[top] = b; top++; // [Changed] } int pick() { if(top == 0) // [Changed] { p("Nothing to display."); return 0; } else { p("(Data[%d] = %d) is the last data.", top, ar[top-1]); // [Changed] return -1; // [Changed] } } int view() { int i; if(top < 0) { p("Nothing to display."); return 0; } else { for(i = 0; i < top; i++) // [Changed] { p("Data[%d] = %d\n", i, ar[i]); } return -1; // [Changed] } } </code></pre>
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1. POWhat is wrong with my program implementing a stack in C
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1. PTAnswer
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1. USBrandin
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1. COthis also works. thank you.
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