C++ :
#include<iostream> using namespace std; int main(){ int a,b,c,d,e; for (a=10; a<15; a++){ c=8*a; d=9*a+1; e=9*a; b=100*c+d; if (b>=1000 && b<10000 && c<100 && e>=100 && e<1000) cout<<a<<endl<<b<<endl<<c<<endl<<d<<endl<<e<<endl; } return 0; }
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