函数名:cabs功能:计算复数的绝对值用法:doublecabs(structcomplexz);程序例:#include#includeintmain(void){structcomplexz;doubleval;z
0;val=cabs(z);printf("Theabsolutevalueof%
2lfjis%
2lf",z
y,val);return0;}函数名:calloc功能:分配主存储器用法:void*calloc(size_tnelem,size_telsize);程序例:#include#includeintmain(void){char*str=NULL;/*allocatememoryforstring*/str=calloc(10,sizeof(char));/*copy"Hello"intostring*/strcpy(str,"Hello");/*displaystring*/printf("Stringis%s\n",str);/*freememory*/free(str);return0;}函数名:ceil功能:向上舍入用法:doubleceil(doublex);程序例:#include#includeintmain(void){doublenumber=123
54;doubledown,up;down=floor(number);up=ceil(number);printf("originalnumber%5
2lf\n",number);printf("numberroundeddown%5
2lf\n",down);printf("numberroundedup %5
2lf\n",up);return0;}函数名:cgets功能:从控制台读字符串用法:char*cgets(char*st
