#include #include #include #include #include #include #include #include #include #include #include #pragma STDC FENV_ACCESS ON #define DEBUG 1 static jmp_buf errbuf; extern int errno; int float_to_int(float); int main() { int tmp; float a, b, res; char operator; setlocale(LC_ALL, ""); assert(system(NULL)); errno = 0; if( tmp = setjmp(errbuf) ) { fflush(stdout); fprintf(stderr, "Error: %d", tmp); if(errno) fprintf(stderr, "\nMessage: %s", strerror(errno)); if(tmp < 2) abort(); else goto output; } operator = (char) 0, a = FLT_MAX, b = FLT_MAX; scanf("%f %c %f", &a, &operator, &b); if(operator == (char) 0) { errno = 1; longjmp(errbuf, 1); } if(a == FLT_MAX or b == FLT_MAX) { errno = 5; longjmp(errbuf, 1); } switch(operator) { case '+': res = a + b; break; case '-': res = a - b; break; case '*': res = a * b; break; case '/': res = a / b; break; case '&': res = float_to_int(a) bitand float_to_int(b); break; case '|': res = float_to_int(a) bitor float_to_int(b); break; case '^': res = float_to_int(a) xor float_to_int(b); break; default: errno = 1, longjmp(errbuf, 1); } if(fetestexcept(FE_ALL_EXCEPT)) { fprintf(stderr, "Float error: %d: ", tmp); if(fetestexcept(FE_DIVBYZERO)) fprintf(stderr, "DIVBYZERO"); if(fetestexcept(FE_INEXACT)) fprintf(stderr, "INEXACT"); if(fetestexcept(FE_INVALID)) fprintf(stderr, "INVALID"); if(fetestexcept(FE_OVERFLOW)) fprintf(stderr, "OVERFLOW"); if(fetestexcept(FE_UNDERFLOW)) fprintf(stderr, "UNDERFLOW"); fprintf(stderr, "\n"); longjmp(errbuf, 2); } if(errno) longjmp(errbuf, 1); output: printf("%.24f ~ %d", res, float_to_int(res)); return EXIT_SUCCESS; } inline int float_to_int(float x) { return floor(x + 0.5); }

Float calculator