35 lines
568 B
C
35 lines
568 B
C
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#include <stdio.h>
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#include <ctype.h>
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/* written on new year's eve 2020
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* good night and good riddance */
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char newchar(char c, int i) {
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switch(i) {
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case 0:
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if(isupper(c)) return c + 32;
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if(c == 33) return -2;
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else return c;
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case 1:
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if(islower(c)) return c - 32;
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if(c == 33) return -2;
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else return c;
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default: return -1;
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}
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}
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int advi(int i) {
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switch(i) {
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case 0: return 1;
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case 1: return 0;
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default: return -1;
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}
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}
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int main(void) {
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char c;
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int i = 0;
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while((c = getchar()) != EOF) {
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putchar(newchar(c, i));
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i = advi(i);
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}
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}
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