Question

#include <stdio.h>
#include <ctype.h> /*header for standard tolower function*/
#define STRING_LEN 500

char * changeCase(char *);
void stripspaces(char*, char*, char*);
int isinteger(char*);
int isHex(char*);
void strrev(char*);


int main(void)
{
    char line[STRING_LEN];
    char line1[STRING_LEN];     
    char *p1 = line;          
    char *p2 = line;
    int ok, ok2;
    printf("Enter a string of up to %d characters:\n", STRING_LEN);
    while((*p1++ = getchar()) != '\n');

    changeCase(line);
    puts("resulting string is:\n");
    printf("%s", line);
    stripspaces(line, p1, p2);
    ok = isinteger(line);
    if (ok)
    {
        printf("%s is an integer\n", line);
    }
    else
    {
        printf("\n%s is NOT an integer\n", line);
    }   
    ok2 = isHex(line);
    if (ok2)
    {
        printf("\n%s is a hex value \n", line);
    }
    else
    {
        printf("\n%s is NOT a hex value\n", line);
    }   

     strrev(line); 

     printf("string is:");
     printf("%s", line);  


    getch();    
    getch();
    return 0; 
}/*end main*/

char * changeCase(char *s){ 

    char *ptr;
    ptr = s;                /* point to start of string*/
    while ( *s != '\0')     /*keep going until you reach nul (end of string)*/
    {

          if(!isdigit(*s))
          {

                      if(isupper(*s))
                      {

                                 *s = tolower(*s);

                      } 

                      else if (islower(*s))
                      {

                                 *s = toupper(*s);

                      }
                      }                
        s++;                /*move to the next character*/
    }
    return ptr;             /* return lowercase version of the string*/

}/*end stringToLower*/

void stripspaces (char *s, char *x1, char *x2){ 
   *x1 = '\0';                 
   x1 = s;                
   while(*x1 != '\0')    
   {    
     if(*x1 == ' ')  
     {                    
       ++x1;              
       continue;  
     }  
     else   
       *x2++ = *x1++;   
   }  
   *x2 = '\0';          
   printf("\nWith the spaces removed, the string is now:\n%s\n", s);  
}

int isinteger(char *s)          /* s is a string */
{                   /* function returns 1(true) or 0(false) */

    if(*s == '+' || '-' || ' '){
          s++;
          } 

    while (*s != '\0')
    {       

        if (!isdigit(*s)) 
        {
                          return 0; 

                          }

        s++;            /* move to next character */
        return 1;
    }


    }
int isHex(char *s)
{

  while (*s != '\0'){
  if (!isxdigit(*s)){

  return 0; 

                       }
  else {

  return 1; 

       }   s++; }
} 
void strrev(char *p) 
{ 
int i,j; 
j = strlen(p);
char temp; 

for (i = 0; i < j; i++) // subscript i goes halfway
{
temp = p[i]; // swap
p[i] = p[j-1-i]; // opposite
p[j-1–i] = temp; // elements
}
}

这个程序在＆＃34; p [j-1-i] = temp;＆＃34;交换函数中出现错误。错误如下＆＃34; stray＆＃34; \ 150＆＃34;在节目＆＃34;想知道我如何解决这个错误

包含错误的函数应该反转内存中的字符串行，以便在函数运行后打印行时字符串反向。不确定这是否真的有效，如果有人也可以指出我在那里制造的任何错误，那将会很有用。

Answer 1

仔细查看第二个减号：

p[j-1–i] = temp; // elements

在我的机器上看起来像这样：–。它比-长，所以它显然是一个不同的角色。减号是ASCII 45，而编译器抱怨的字符是ASCII 150。

要修复，只需将该行替换为：

p[j-1-i] = temp; // elements

在程序中，在交换功能中迷路“\ 150”

1 个答案: