c语言不用预编译手写操作字符串
c语言中对字符串的 拼接，比较，大小写转换，长度
#include<stdio.h>
#include<string.h>
int main() {
//*************
int length(char *s);
void cat (char *s,char *b);
void upcase(char *p);
int cmp(char *s,char *b);
//*************
char s[81]={'1','2','3'};
char b[10] = "abcdXYZ";
//
int a = 0;
printf("字符串'A'中内容如下
");
while(s[a] != ' '){
printf("%c",s[a]);
a ++;
}
printf("
");
printf("字符串'X'中内容如下
");
int x = 0;
while(b[x] != ' '){
printf("%c",b[x]);
x++;
}
//拼接
cat(s,b);
int cs = 0 ;
printf("
");
printf("字符串拼接打印
");
while(s[cs] != ' '){
printf("%c",s[cs]);
cs ++;
}
//长度
int len;
len = length(s);
printf("
");
printf("长度打印
");
printf("%d",len);
printf("
");
//大小写
upcase(s);
int css = 0 ;
printf("大小写开始打印
");
while(s[css] != ' '){
printf("%c",s[css]);
css ++;
}
printf("
");
//第几位不同
int cmps;
char *sscmp = "12345";
char *sccmp = "123";
cmps = cmp(sscmp,sccmp);
printf("第一个数组如下
");
puts(sscmp);
printf("第二个数组如下
");
puts(sccmp);
printf("第%d位不同
",cmps);
return 0;
}
int cmp(char *s,char *b) {
//位数比较
int i = 1;
while(*s == *b){
i++;
s++;
b++;
}
return i;
}
void cat(char *s,char *b){
//字符串拼接
int i = 0;
int c = 0;
while(s[i]!=' '){
i++;
if(s[i] == ' '){
while(b[c] != ' '){
s[i] = b[c];
c++;
i++;
}
}
}
}
int length(char *p) {
//字符串长度
int i = 0;
while (*p!=' '){
i++;
*p++;
}
return i;
}
void upcase(char *p){
//大小写转换
while(*p!=' '){
if( *p >= 'a' && *p <= 'z') {
*p-= 32;
}
else if( *p >= 'A' && *p <= 'Z') {
*p+= 32;
}
p++;
}
}