c语言之库函数f开头.docVIP

c语言之库函数f开头 函数名: fabs 功 能: 返回浮点数的绝对值 用 法: double fabs(double x); 程序例: #include stdio.h #include math.h int main(void) { float number = -1234.0; printf(number: %f absolute value: %f\n, number, fabs(number)); return 0; } 函数名: farcalloc 功 能: 从远堆栈中申请空间 用 法: void far *farcalloc(unsigned long units, unsigned ling unitsz); 程序例: #include stdio.h #include alloc.h #include string.h #include dos.h int main(void) { char far *fptr; char *str = Hello; /* allocate memory for the far pointer */ fptr = farcalloc(10, sizeof(char)); /* copy Hello into allocated memory */ /* Note: movedata is used because you might be in a small data model, in which case a normal string copy routine can not be used since it assumes the pointer size is near. */ movedata(FP_SEG(str), FP_OFF(str), FP_SEG(fptr), FP_OFF(fptr), strlen(str)); /* display string (note the F modifier) */ printf(Far string is: %Fs\n, fptr); /* free the memory */ farfree(fptr); return 0; } 函数名: farcoreleft 功 能: 返回远堆中未作用存储区大小 用 法: long farcoreleft(void); 程序例: #include stdio.h #include alloc.h int main(void) { printf(The difference between the\ highest allocated block in the\ far\n); printf(heap and the top of the far heap\ is: %lu bytes\n, farcoreleft()); return 0; } 函数名: farfree 功 能: 从远堆中释放一块 用 法: void farfree(void); 程序例: #include stdio.h #include alloc.h #include string.h #include dos.h int main(void) { char far *fptr; char *str = Hello; /* allocate memory for the far pointer */ fptr = farcalloc(10, sizeof(char)); /* copy Hello into allocated memory */ /* Note: movedata is used because you might be in a small data model, in which case a normal string copy routine cant be used since it assumes the pointer size is near. */ movedata(FP_SEG(str), FP_OFF(str), FP_SEG(fptr), FP_OFF(fptr), strlen(str)); /* disp