n = 5;
        switch(n){
        case 1:
        case 2:
        case 3:
        case 4:
                printf("1-4\n");
                break;
        defualt:
                printf("other\n");
                break;
        }

#define CACL(x)        x * 3 + 4

        n = 1;
        printf("%d\n", CALC(n+2));

#include <stdio.h>

main ()
{
        FILE  *fp;
        int   a, b;

        if((fp = fopen("test.dat", "r")) == NULL)
                return;
        while(fscanf(fp, "%d %d\n", &a, &b) != EOF){
                printf("%d, %d\n", a, b);
        }
        fclose(fp);
}


test.datの内容
1 23
3 44
3 5O