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#include <stdio.h>
 
int main(void) {
	int a=1, b=a%10;
	int sum=0;
 
 
	while( a!=3a , a!=5a , b>=6 )
	{
		sum = sum + a;
		a = a + 1;
	}
 
	printf("1から100の合計は%dです。 \n", sum);
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:8:12: error: invalid suffix "a" on integer constant
  while( a!=3a , a!=5a , b>=6 )
            ^~
prog.c:8:20: error: invalid suffix "a" on integer constant
  while( a!=3a , a!=5a , b>=6 )
                    ^~
prog.c:8:15: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  while( a!=3a , a!=5a , b>=6 )
               ^
prog.c:8:23: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  while( a!=3a , a!=5a , b>=6 )
                       ^

Standard output is empty