77 lines
4.5 KiB
C
77 lines
4.5 KiB
C
#include <stdio.h>
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#include <math.h>
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int main();
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int main2();
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int main3();
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int main4();
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int main() {
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printf("+inf:\n");
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float fx = (float)INFINITY; unsigned int *fxi = (unsigned int*)&fx;
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double dx = (double)INFINITY; long unsigned long int *dxi = (long unsigned long int*)&dx;
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long double ldx = (long double)INFINITY; long unsigned long int *ldxi1 = (long unsigned long int*)&ldx; long unsigned long int *ldxi2 = &(ldxi1[1]);
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printf("\t\tf d ld\n");
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printf("correct:\t%x %x %x\n", isinf(fx), isinf(dx), isinf(ldx));
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printf("as floats:\t%x %x %x\n", isinf(*(float*)fxi), isinf(*(float*)dxi), isinf(*(float*)ldxi1));
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printf("as double:\t%x %x %x\n", isinf(*(double*)fxi), isinf(*(double*)dxi), isinf(*(double*)ldxi1));
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printf("as long double:\t%x %x %x\n", isinf(*(long double*)fxi), isinf(*(long double*)dxi), isinf(*(long double*)ldxi1));
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printf("sizes ?4 8 12?:\t%d %d %d\n", (int)sizeof(fx), (int)sizeof(dx), (int)sizeof(ldx));
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printf("sizes:\t%d %d %d\n", (int)sizeof(*fxi), (int)sizeof(*dxi), (int)sizeof(*ldxi1)*2);
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printf("bit repr:\n f: %x\n d: %llx\n ld: %llx%llx\n", *fxi, *dxi, (0xFFFF)&*ldxi2, *ldxi1);
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printf("\n");
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main2();
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return 0;
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}
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int main2() {
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printf("-inf:\n");
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float fx = (float)-INFINITY; unsigned int *fxi = (unsigned int*)&fx;
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double dx = (double)-INFINITY; long unsigned long int *dxi = (long unsigned long int*)&dx;
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long double ldx = (long double)-INFINITY; long unsigned long int *ldxi1 = (long unsigned long int*)&ldx; long unsigned long int *ldxi2 = &(ldxi1[1]);
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printf("\t\tf d ld\n");
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printf("correct:\t%x %x %x\n", isinf(fx), isinf(dx), isinf(ldx));
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printf("as floats:\t%x %x %x\n", isinf(*(float*)fxi), isinf(*(float*)dxi), isinf(*(float*)ldxi1));
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printf("as double:\t%x %x %x\n", isinf(*(double*)fxi), isinf(*(double*)dxi), isinf(*(double*)ldxi1));
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printf("as long double:\t%x %x %x\n", isinf(*(long double*)fxi), isinf(*(long double*)dxi), isinf(*(long double*)ldxi1));
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printf("sizes ?4 8 12?:\t%d %d %d\n", (int)sizeof(fx), (int)sizeof(dx), (int)sizeof(ldx));
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printf("bit repr:\n f: %x\n d: %llx\n ld: %llx%llx\n", *fxi, *dxi, (0xFFFF)&*ldxi2, *ldxi1);
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printf("\n");
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main3();
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return 0;
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}
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int main3() {
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printf("+NaN:\n");
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float fx = (float)NAN; unsigned int *fxi = (unsigned int*)&fx;
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double dx = (double)NAN; long unsigned long int *dxi = (long unsigned long int*)&dx;
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long double ldx = (long double)NAN; long unsigned long int *ldxi1 = (long unsigned long int*)&ldx; long unsigned long int *ldxi2 = &(ldxi1[1]);
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printf("\t\tf d ld\n");
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printf("correct:\t%x %x %x\n", isnan(fx), isnan(dx), isnan(ldx));
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printf("as floats:\t%x %x %x\n", isnan(*(float*)fxi), isnan(*(float*)dxi), isnan(*(float*)ldxi1));
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printf("as double:\t%x %x %x\n", isnan(*(double*)fxi), isnan(*(double*)dxi), isnan(*(double*)ldxi1));
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printf("as long double:\t%x %x %x\n", isnan(*(long double*)fxi), isnan(*(long double*)dxi), isnan(*(long double*)ldxi1));
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printf("sizes ?4 8 12?:\t%d %d %d\n", (int)sizeof(fx), (int)sizeof(dx), (int)sizeof(ldx));
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printf("sizes:\t%d %d %d\n", (int)sizeof(*fxi), (int)sizeof(*dxi), (int)sizeof(*ldxi1)*2);
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printf("bit repr:\n f: %x\n d: %llx\n ld: %llx%llx\n", *fxi, *dxi, (0xFFFF)&*ldxi2, *ldxi1);
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printf("\n");
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main4();
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return 0;
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}
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int main4() {
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printf("-NaN:\n");
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float fx = (float)-NAN; unsigned int *fxi = (unsigned int*)&fx;
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double dx = (double)-NAN; long unsigned long int *dxi = (long unsigned long int*)&dx;
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long double ldx = (long double)-NAN; long unsigned long int *ldxi1 = (long unsigned long int*)&ldx; long unsigned long int *ldxi2 = &(ldxi1[1]);
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printf("\t\tf d ld\n");
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printf("correct:\t%x %x %x\n", isnan(fx), isnan(dx), isnan(ldx));
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printf("as floats:\t%x %x %x\n", isnan(*(float*)fxi), isnan(*(float*)dxi), isnan(*(float*)ldxi1));
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printf("as double:\t%x %x %x\n", isnan(*(double*)fxi), isnan(*(double*)dxi), isnan(*(double*)ldxi1));
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printf("as long double:\t%x %x %x\n", isnan(*(long double*)fxi), isnan(*(long double*)dxi), isnan(*(long double*)ldxi1));
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printf("sizes ?4 8 12?:\t%d %d %d\n", (int)sizeof(fx), (int)sizeof(dx), (int)sizeof(ldx));
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printf("bit repr:\n f: %x\n d: %llx\n ld: %llx%llx\n", *fxi, *dxi, (0xFFFF)&*ldxi2, *ldxi1);
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printf("\n");
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return 0;
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}
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