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#include<stdio.h>
void main()
{
    int b[5],i,x=0,j=1,a[]={2,3,4,5,6};
    for(i=0;i<5;i++)
    {
        for(j=1;j<=2,j++)
        {
            b[x++]=a[i]*b[j];
        }
        for(;j<5;j++)
        {
            b[x++]=a[i]*b[j];
        }
        b[x++]=a[i]*a[j-1];
    }
    for(i=0;i<5;i++)
    printf("%d",b[i]);
}

prog.c:2:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main()
      ^~~~
prog.c: In function ‘main’:
prog.c:7:21: warning: left-hand operand of comma expression has no effect [-Wunused-value]
         for(j=1;j<=2,j++)
                     ^
prog.c:7:25: error: expected ‘;’ before ‘)’ token
         for(j=1;j<=2,j++)
                         ^
                         ;

Standard output is empty