c strchr()函数的结果 C语言字符串操作总结大全(2)

strncpy(char destination[], const char source[], int numchars);

strncpy：将字符串source中前numchars个字符拷贝到字符串destination中。??

strncpy函数应用举例??

原型：strncpy(char destination[], const char source[], int numchars);??

功能：将字符串source中前numchars个字符拷贝到字符串destination中??

例程：??

#include <iostream.h>??

#include <string.h>??

void main(void)??

{??

char str1[10] = { "Tsinghua "};??

char str2[10] = { "Computer"};??

cout <<strncpy(str1,str2,3)<<endl;??

}

运行结果：Comnghua??

注意：字符串source中前numchars个字符将覆盖掉字符串destination中前numchars个字符！

原型：strcat(char target[], const char source[]);??

功能：将字符串source接到字符串target的后面??

例程：??

#include <iostream.h>??

#include <string.h>??

void main(void)??

{??

char str1[] = { "Tsinghua "};??

char str2[] = { "Computer"};??

cout <<strcpy(str1,str2)<<endl;??

}

运行结果：Tsinghua Computer

注意：在定义字符数组1的长度时应该考虑字符数组2的长度，因为连接后新字符串的长度为两个字符串长度之和。进行字符串连接后，字符串1的结尾符将自动被去掉，在结尾串末尾保留新字符串后面一个结尾符。??

原型：strncat(char target[], const char source[], int numchars);??

功能：将字符串source的前numchars个字符接到字符串target的后面??

例程：

#include <iostream.h>??

#include <string.h>??

void main(void)??

{??

char str1[] = { "Tsinghua "};??

char str2[] = { "Computer"};??

cout <<strncat(str1,str2,3)<<endl;??

}

运行结果：Tsinghua Com

原型：int strcmp(const char firststring[], const char secondstring);??

功能：比较两个字符串firststring和secondstring??

例程：??

#include <iostream.h>??

#include <string.h>??

void main(void)??

{??

char buf1[] = "aaa";??

char buf2[] = "bbb";??

char buf3[] = "ccc";??

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