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41 lines
928 B
C
41 lines
928 B
C
/* div-test.c
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**
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** This program tests the division and modulo operators
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** and the div() library function.
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**
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** 2002-10-24, Greg King
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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static bool test(int dividend, int divisor) {
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div_t result;
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(long)result = (long)div(dividend, divisor);
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printf("%+d/%+d= %+d, %+d%%%+d= %+d, div()= %+d, %+d\n",
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dividend, divisor, dividend / divisor,
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dividend, divisor, dividend % divisor,
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result.quot, result.rem);
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return result.quot * divisor + result.rem != dividend;
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}
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int main(void) {
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bool t;
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printf("\nTest of division and modulus operations:\n\n");
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t = test(+40, +3) ||
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test(+40, -3) ||
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test(-40, +3) ||
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test(-40, -3);
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if (t)
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printf("\nThe div() function made a wrong result!\n");
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#ifdef __ATARI__
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/* Atari DOS 2 clears the screen after program-termination, so wait. */
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printf("\nTap a key, to exit. ");
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getchar();
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#endif
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return (int)t;
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}
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