45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "stack.h"
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int main(void)
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{
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StackNode *s = NULL;
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// push 3 integers
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int *a = malloc(sizeof(int)); *a = 1; s = push(s, a);
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int *b = malloc(sizeof(int)); *b = 2; s = push(s, b);
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int *c = malloc(sizeof(int)); *c = 3; s = push(s, c);
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// top should be c (3)
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int *topv = (int *)top(s);
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if(topv == NULL || *topv != 3) { fprintf(stderr, "stack top expected 3\n"); return 1; }
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// pop -> now top should be 2
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s = pop(s);
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topv = (int *)top(s);
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if(topv == NULL || *topv != 2) { fprintf(stderr, "stack top expected 2 after pop\n"); return 2; }
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// pop -> now top should be 1
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s = pop(s);
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topv = (int *)top(s);
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if(topv == NULL || *topv != 1) { fprintf(stderr, "stack top expected 1 after pop\n"); return 3; }
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// pop last
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s = pop(s);
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if(s != NULL) { fprintf(stderr, "stack expected empty after popping all\n"); return 4; }
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// free stored data (stack does not free data)
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free(a); free(b); free(c);
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// test clearStack on empty and small stacks
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s = push(s, malloc(sizeof(int)));
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s = push(s, malloc(sizeof(int)));
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clearStack(s); // clearStack must free nodes but not payload; free payloads not necessary because we leaked intentionally for test of API
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// Note: above payloads are not freed (stack API spec); this test ensures clearStack doesn't crash.
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// Success
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printf("test_stack: OK\n");
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return 0;
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}
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