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23 lines
588 B
C
23 lines
588 B
C
#include<string.h>
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#include<ctype.h>
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char* convert_message(const char *message, char receiver) {
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char *out = strdup(message);
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if (receiver != 'M' && receiver != 'L') return "Mit dir schreib ich nicht!";
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int c = 0;
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for (int i = 0; message[i] != '\0'; i++) {
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if (isalpha(message[i])) {
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if (receiver == 'M') {
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if (c % 2 == 1) out[i] = toupper(message[i]);
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else out[i] = tolower(message[i]);
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}
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else {
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if (c % 2 == 0) out[i] = toupper(message[i]);
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else out[i] = tolower(message[i]);
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}
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c++;
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}
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}
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return out;
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}
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