Script started on Fri Jan 21 18:21:31 2000
[hazel:]% cat kadai.c
#include <stdio.h>

main()
{
    char s[10000];
    char fin[100];
    char fout[100];
    int n;
    int i;
    FILE *in,*out;

    printf("Input file name: ");        /* ファイル名の入力 */
    scanf("%s",fin);
    printf("Output file name: ");
    scanf("%s",fout);

    if ((in=fopen(fin,"r"))==NULL) {    /* ファイルオープン */
        printf("入力ファイルをオープンできません");
        exit(1);
    }
    if ((out=fopen(fout,"w"))==NULL) {
        printf("出力ファイルをオープンできません");
        exit(1);
    }

    fgets(s,10000,in);  /* 入力 */

    n=0;
    i=0;

    while( s[i] != 0 ){
      if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')){
          if(i==0 || (!((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z')))){
                  n = n + 1;
          }
       }
       i = i + 1;
    }

    fprintf(out,"String= %s \n", s );   /* 出力 */
    fprintf(out,"Word count=%d\n", n ); 

    fclose(in); /* クローズ */
    fclose(out);
}

[hazel:]% gcc -o kadai kadai.c
[hazel:]% cat test.txt
If you have any questions, raise your hands.
[hazel:]% kadai
Input file name: test.txt
Output file name: out.txt
[hazel:]% cat out.txt
String= If you have any questions, raise your hands.
Word count=8
[hazel:]% exit
script done on Fri Jan 21 18:22:31 2000