C语言排错#include <stdio.h> #include <stdlib.h> unsigned int NumofChar(char * str,char ch) { int count=0; char *p=str; while(*p!='\0') { if((*p++)==ch) {count++;} } return count; } char * DelChar(char * str,char ch,unsigned int n) { char *s=str; int co=0; while(co<n) { if(*s==ch) { co++; for(char* p=s;*p!='\0';p++) *p=*(p+1); s--; } s++; }a return s; } int main() { char str[100]; printf("Please input the string!\n"); gets(str); char c; printf("Please input the character!\n"); scanf("%c",&c); unsigned int count=NumofChar(str,c); if(count==0) { printf("Not found!"); return 0; } printf("The number of %c is %d!\nWhich one do you want to delete?Please input the serial number:\n",c,count); int sn;//第几个数字 scanf("%d",&sn); printf("%s",DelChar(str,c,sn)); return 0; }

在函数 `DelChar` 的第 21 行，多了一个 `a` 字符，需要删除。此外，在删除字符的过程中，应该先把 `s` 指针移动到要删除的字符位置，然后再进行删除操作。修改后的代码如下所示：

#include <stdio.h> 
#include <stdlib.h> 

unsigned int NumofChar(char * str,char ch) {     
    int count=0;     
    char *p=str;     
    while(*p!='\0')     
    {         
        if((*p++)==ch)         
        {count++;}     
    }     
    return count; 
}  

char * DelChar(char * str,char ch,unsigned int n) {     
    char *s=str;     
    int co=0;     
    while(co<n && *s!='\0')     
    {         
        if(*s==ch)         
        {             
            co++;             
            char* p=s;             
            while (*p!='\0')             
            {                 
                *p=*(p+1);                 
                p++;             
            }             
            s--;         
        }         
        s++;     
    }         
    return str; 
}  

int main() {     
    char str[100];     
    printf("Please input the string!\n");     
    gets(str);     
    char c;     
    printf("Please input the character!\n");     
    scanf("%c",&c);     
    unsigned int count=NumofChar(str,c);     
    if(count==0)     
    {         
        printf("Not found!");         
        return 0;     
    }     
    printf("The number of %c is %d!\nWhich one do you want to delete?Please input the serial number:\n",c,count);     
    int sn;//第几个数字     
    scanf("%d",&sn);     
    printf("%s",DelChar(str,c,sn));     
    return 0; 
}