07/06/25 11:41:20
>>151
1.
#include <stdio.h>
#include <ctype.h>
int main(void){
int ch;
while((ch = getchar()) != EOF){
if(islower(ch)) putchar(toupper(ch));
else if(isupper(ch)) putchar(tolower(ch));
else putchar(ch);
}
return 0;
}
2.
#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main(void){
int i, count[10] = {0};
char buf[2] = {0}, *p = buf;
while((*p = getchar()) != EOF)
if(isdigit(*p))
count[atoi(buf)]++;
for(i = 0; i < 10; i++) printf("%d : %d\n", i, count[i]);
return 0;
}