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public c v1 · immutable#include <ctype.h>#include <stdio.h>int main(){ char c; while ((c = getchar()) != EOF) { if (isupper(c)) c = tolower(c); else if (islower(c)) c = toupper(c); putchar(c); } return 0;}#include <ctype.h>#include <stdio.h>int main(){ char c; while ((c = getchar()) != EOF) { if (isupper(c)) c = tolower(c); else if (islower(c)) c = toupper(c); putchar(c); } return 0;}