| C语言库函数(C类字母) |
|
| 作者:未知 文章来源:网络收集 点击数: 更新时间:2006-3-29 15:22:24
|
数名: cabs 功 能: 计算复数的绝对值 用 法: double cabs(struct complex z); 程序例: #include #include
int main(void) { struct complex z; double val;
z.x = 2.0; z.y = 1.0; val = cabs(z);
printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); return 0; }
函数名: calloc 功 能: 分配主存储器 用 法: void *calloc(size_t nelem, size_t elsize); 程序例:
#include #include
int main(void) { char *str = NULL;
/* allocate memory for string */ str = calloc(10, sizeof(char));
/* copy "Hello" into string */ strcpy(str, "Hello");
/* display string */ printf("String is %s\n", str);
/* free memory */ free(str);
return 0; }
函数名: ceil 功 能: 向上舍入 用 法: double ceil(double x); 程序例:
#include #include
int main(void) { double number = 123.54; double down, up;
down = floor(number); up = ceil(number);
printf("original number %5.2lf\n", number); printf("number rounded down %5.2lf\n", down); printf("number rounded up %5.2lf\n", up);
return 0; }
函数名: cgets 功 能: 从控制台读字符串 用 法: char *cgets(char *str); 程序例:
#include #include
int main(void) { char buffer[83]; char *p;
/* There's space for 80 characters plus the NULL terminator */ buffer[0] = 81;
printf("Input some chars:"); p = cgets(buffer); printf("\ncgets read %d characters: \"%s\"\n", buffer[1], p); printf("The returned pointer is %p, buffer[0] is at %p\n", p, &buffer);
/* Leave room for 5 characters plus the NULL terminator */ buffer[0] = 6;
printf("Input some chars:"); p = cgets(buffer); printf("\ncgets read %d characters: \"%s\"\n", buffer[1], p)[1] [2] [3] [4] [5] [6] [7] [8] [9] 下一页
|
|
[ 收藏此页到: 天天|和讯|博采|ViVi|狐摘|我摘|天极 ] 文章录入:kinda 责任编辑:kinda |
|
上一篇文章: C语言库函数(B类字母) 下一篇文章: C语言库函数(D类字母) |
| 【字体:小 大】【发表评论】【加入收藏】【告诉好友】【打印此文】【关闭窗口】 |