mod_str.c

c primer plus 第五版 的源代码

/* mod_str.c -- modifies a string */
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define LIMIT 80
void ToUpper(char *);
int PunctCount(const char *);

int main(void)
{
    char line[LIMIT];

    puts("Please enter a line:");
    gets(line);
    ToUpper(line);
    puts(line);
    printf("That line has %d punctuation characters.\n",
            PunctCount(line));
  
   return 0;
}

void ToUpper(char * str)
{
    while (*str)
    {
        *str = toupper(*str);
        str++;
    }
}

int PunctCount(const char * str)
{
    int ct = 0;
    while (*str)
    {
        if (ispunct(*str))
            ct++;
        str++;
    }
  
    return ct;
}