C语言一些常见的操作字符串方法

// 首字母大写
for(int i=;(c=string[i])!='\0';i++)      //  字符串碰到\0结束   C知识
{
    if (c==' ') {
        printf("%c",c),
        word=;
    }else if (word==)
    {
        word=;
        if (c>=&&c<) {     //转换ASCII
            c=c-;
        }
        num++;
        printf("%c",c);
    }else if (word==){
        printf("%c",c);
    }
}
//  去空格
char s1[];
printf("请输入一串字符串：\n");
scanf("%s",array);
int count=;
char s2[];
for (int i = ; i<s1.length; i++) {
    if(s1[i]!=' '){
        s2[count]=s1[i];
        count++;
    }
}
 
// 求最大字符串  ,
 
for (int i = ;i<=strlen(s);i++) {
    if(s[i]!=' '){count++;}
    if (s[i]==' '||s[i]=='\0'){
        if(maxLen<count){maxLen = count;maxindex = i-maxLen;
        }
        count=;
        }
    if(maxlen<count){
        maxLen=count;maxindex=i-maxLen+;
    }
}
 
// 字符串反转,
 
unsigned int len = sizeof(str);
char temp[len];
for(int i=;i<len;i++){
    int a = len-i-;
    temp[i]=str[a];
    if(i==len-){
        temp[i] = str[i];
    }
}

// 求最大公共字符串
 
void maxPublicString(char *s1,char *s2){
    unsigned long s1len = strlen(s1);
    unsigned long s2len = strlen(s2);
    int index =  ,count = ;
    for(int i = ; i<s1len ; i++)
    {
        for(int j = ; j<s2len; j++){
            if(s1[i]==s2[j]){
                for(int k =  ;s1[i+k]==s2[j+k] && s2[j+k]!='\0' && s1[i+k]!='\0' ;k++){
                    if(k>count){
                        count = k;//公共字符数
                        index = i;//下标
                    }
                }
            }
        }
    }
    if(count == ){
        printf("没找到最大公共字符串\n");
    }
    else{
        printf("最长公共字符串是:");
        for(int i =  ; i<=count; i++){
            printf("%c",s1[index+i]);
        }
    }
    printf("\n");
}