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- $ cat t.c
- #include <stdio.h>
- #include <math.h>
- #include <fenv.h>
- int main(){
- printf("default:%.0f\n", 1.5);
- fesetround(FE_DOWNWARD);
- printf("down:%.0f\n", 1.5);
- fesetround(FE_UPWARD);
- printf("up:%.0f\n", 1.5);
- }
- $ gcc t.c && ./a.out
- default:2
- down:1
- up:2
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