超速时c的输出没有%，这个加 \ 后可以输出吗

a.c: In function ‘main’:
a.c:10:25: warning: unknown conversion type character 0x20 in format [-Wformat=]
printf("Exceed %.0lf%. Ticket 200",c);
^
a.c:13:25: warning: unknown conversion type character 0x20 in format [-Wformat=]
printf("Exceed %.0lf%. License Revoked",c);
^
a.c:4:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%lf %lf",&v,&s);
^~~~~~~~~~~~~~~~~~~~~~
这个是提交后显示的错误