online compiler and debugger for c/c++

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Source Code    Language
#include <stdio.h> #include <stdlib.h> int main(void){ int x; while(scanf("%d",&x)!=-1){ printf("%d\n",x>23?-1:(x>=15?x-15:(x>=0?x+9:-1)));/*防止出題者所提供的測資會有"24"或"-1"*/ } return 0; }

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