#include main() { float a,b,e; scanf ("%f,%f",&a,&b); e=a-b; printf("e=%f\n"); }

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#include main() { float a,b,e; scanf ("%f,%f",&a,&b); e=a-b; printf("e=%f\n"); }
#include main() { float a,b,e; scanf ("%f,%f",&a,&b); e=a-b; printf("e=%f\n"); }

#include main() { float a,b,e; scanf ("%f,%f",&a,&b); e=a-b; printf("e=%f\n"); }
printf("e=%f\n",e);