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#include <stdio.h>
int Flag_1s,hz,he,mz,me,sz,se;
main() {
for(;;) { // mainloop
Flag_1s = 1;
printf("%d%d:%d%d:%d%d\n",hz,he,mz,me,sz,se);
if (Flag_1s) {
Flag_1s = 0; // Flag zurücksetzen
if (se < 9) se++;
else {
se = 0;
if (sz < 5) sz++;
else {
sz = 0;
if (me < 9) me++;
else {
me = 0;
if (mz < 5) mz++;
else {
mz = 0;
if (he < 9) {
he++;
if (hz==2 && he==4) hz = he = 0; // Tagesüberlauf
}
else {
he = 0;
if (hz < 2) hz++;
}
}
}
}
}
}
}
}