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浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
浮点数在内存中的表示 - C/C++ - 清泛网移动版 - 专注C++内核技术
...", f1);
// 0 10000101 11110110000000000000000
void * p = (void *)0x42fb0000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
// 1 11111111 00000000000000000000000
p = (void *)0xff800000;
memcpy(&f1, &p, 4);
printf("%f\n", f1);
return 0;
}
运行结果：
好了，就写到这...
Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...to do such "unsafe" FP optimizations, but GCC (on anything other than the x87) makes a reasonable attempt at following IEEE 754 - it's not "error bounds"; there is only one correct answer.
– tc.
Jun 22 '11 at 2:19
...
Reading an image file into bitmap from sdcard, why am I getting a NullPointerException?
...
answered Jan 3 '12 at 10:46
JitendraJitendra
87377 silver badges2121 bronze badges
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