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#include <iostream>
using namespace std;
 
int main() {
int a=0;
int b=0;
int c=0;
int d=0;
for(;a<=100;a++)
for(;a<=100;b++)
for(;a<=100;c++)
for(;a<=100;d++)
if(b==a*2;a1+a2==a*3;b+a2+a3==a*5){
cout<<b<<""<<c<<""<<d<<end1}
 
 
}

prog.cpp: In function ‘int main()’:
prog.cpp:13:10: error: expected ‘)’ before ‘;’ token
 if(b==a*2;a1+a2==a*3;b+a2+a3==a*5){
          ^
prog.cpp:13:11: error: ‘a1’ was not declared in this scope
 if(b==a*2;a1+a2==a*3;b+a2+a3==a*5){
           ^~
prog.cpp:13:14: error: ‘a2’ was not declared in this scope
 if(b==a*2;a1+a2==a*3;b+a2+a3==a*5){
              ^~
prog.cpp:13:27: error: ‘a3’ was not declared in this scope
 if(b==a*2;a1+a2==a*3;b+a2+a3==a*5){
                           ^~

Standard output is empty