C语言字符串操作

C语言字符串操作

一、字符串初始化

[c]
# include <stdio.h>
# include <string.h>

main(){
	char str1[4] = "abc";
	char str2[4] = {'a', 'b', 'c', '\0'};
	printf("%s\n%s\n", str1, str2);
}
[/c]

二、字符串赋值

[c]
# include <stdio.h>
# include <string.h>

main(){
	char str[4];
	strcpy(str, "abc");
	printf("%s\n", str);
}
[/c]

三、字符指针赋值

[c]
# include <stdio.h>
# include <string.h>

main(){
	char *str;
	str = "abc";
	printf("%s\n", str);
}
[/c]

四、连接字符串

[c]
#include <stdio.h>
#include <string.h>

int main ()
{
	// strcpy 覆盖原字符串头部
	// strcat 往字符串空白部分添加
    char str[80];
    strcpy(str, "these ");
    strcpy(str, "strings ");
    strcat(str, "are ");
    strcat(str, "concatenated.");
    printf("%s\n", str);
    return 0;
}
[/c]

五、分割字符串

[c]
#include <stdio.h>
#include <string.h>

main(){
	// strtok 第一个参数先是待分割字符串,然后是 NULL
    char s[] = "ab-cd : ef;gh :i-jkl;mnop;qrs-tu: vwx-y;z";
    char *delim = ":";
    char *p;
    printf("%s ", strtok(s, delim));
    while((p = strtok(NULL, delim)))
        printf("%s\n", p);
}
[/c]

六、字符串首次出现位置

[c]
#include<stdio.h>
#include<string.h>

int main(){
    char *str = "http://see.xidian.edu.cn/cpp/u/xitong/";
    char *substr = "see";
    char *s = strstr(str, substr);
    printf("%s\n", s);
    return 0;
}
[/c]