Warum ich C nicht mag

int checkInput(char *string) {int i;int goodString = 1;for (i = 0; i < strlen(string); i++) {if ((string[i] < 65|| string[i] > 90) && (string[i] < 97 || string[i] > 122)) {goodString = 0;}}return goodString;}void toLower(char *string) {int i;for (i = 0; i < strlen(string); i++) {if (string[i] >= 65 && string[i] <= 90){string[i] = string[i] + 32;}}}int isPalindrom(char *string){}int main() {printf("%i\n", checkInput("aad"));char text[]="DeiMuddersEIGsicht";toLower(text);printf("%s\n",text); printf("%i\n",checkInput("\n"));printf("%i\n",checkInput("DeiMudder"));printf("%c\n", 'A' + 32);}


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