learning-cc4e

Solution to https://cc4e.com/. If you copy these you're not right in the head.
git clone https://kaka.farm/~git/learning-cc4e
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main.c (213B)

      1 #include <stdio.h>
      2 int main() {
      3   int lower();
      4   printf("Lower M is %c\n", lower('M'));
      5   printf("Lower x is %c\n", lower('x'));
      6   printf("Lower @ is %c\n", lower('@'));
      7   printf("Lower M is %c\n", lower('M'));
      8 }