text: #include <stdio.h>
  
  int main()
  {
      char line[150];
      int i, vowels, consonants, digits, spaces;
  
      vowels =  consonants = digits = spaces = 0;
  
      printf("输入一个字符串: ");
      scanf("%[^\n]", line);
  
      for(i=0; line[i]!='\0'; ++i) {
          if(line[i]=='a' || line[i]=='e' || line[i]=='i' ||
             line[i]=='o' || line[i]=='u' || line[i]=='A' ||
             line[i]=='E' || line[i]=='I' || line[i]=='O' ||
             line[i]=='U') {
              ++vowels;
          } else if((line[i]>='a'&& line[i]<='z') || (line[i]>='A'&& line[i]<='Z')) {
              ++consonants;
          } else if(line[i]>='0' && line[i]<='9') {
              ++digits;
          } else if (line[i]==' ') {
              ++spaces;
          }
      }
  
      printf("元音: %d",vowels);
      printf("\n辅音: %d",consonants);
      printf("\n数字: %d",digits);
      printf("\n空白符: %d", spaces);
  
      return 0;
  }
  