#include<stdio.h>
 
typedef struct {
    char    str[100];
    int     modify_index;
    char    modify_ch;
} DATA;
 
void abc(DATA * dt)
{
    dt->str[dt->modify_index] = dt->modify_ch;
}
 
int main(void)
{
    DATA d;
 
    for (d.modify_index = 0; d.modify_index <= 7; d.modify_index++) {
        d.modify_ch = '0' + d.modify_index;
        abc(&d);
    }
    d.modify_ch = '\0';
    abc(&d);
    printf("str = %s\n", d.str);
 
    return 0;
}
 

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