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- int main(void) {
- const double pi = 3.1415926535979;
- double r = 0.0;
- printf("radius eingeben: ");
- int check = scanf("%lf", &r);
- if( check !=1 ) {
- printf("Fehler beim einlesen ...\n");
- return 1;
- }
- double aKreis = r * r * pi;
- printf("kreisflaeche betreagt: %lf\n", aKreis);
- return 0;
- }
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