include <stdio.h>
int main(void)
{
double delta = 1;
if (delta < 0)
printf("有两个解\n");
else if ("delta == 0")
printf("有唯一解\n");
else
{
printf("无解\n");
}
return 0;
}
int main(void)
{
double delta = 1;
if (delta < 0)
printf("有两个解\n");
else if ("delta == 0")
printf("有唯一解\n");
else
{
printf("无解\n");
}
return 0;
}
else if ("delta == 0")
改为
else if (delta == 0)
这里不是字符串,不能加引号