#include <stdio.h>
#include <string.h>int main(void)
{int i = 0;char str[20] = {0};fgets(str,20,stdin);while(str[i] != 0){if(str[i] == ' '){str[i] = '%';i++;}else{i++;}}printf("str = %s\n",str);return 0;
}
#include <stdio.h>
#include <string.h>int main(void)
{int i = 0;char str[20] = {0};fgets(str,20,stdin);while(str[i] != 0){if(str[i] == ' '){str[i] = '%';i++;}else{i++;}}printf("str = %s\n",str);return 0;
}