求教大神 哪里错了 c语言的

#include<stdio.h>

double main()

{

double x,y;

scanf("%f",&x);

printf("输入x的值为");

    if(x<1)

{y=x*x;}   

else

{

x>=10?

y=3x-11: 

      y=2x-1; 

}

printf("y=%f",y);

return 0;

}


错误提示

G:\c语言试水基地\111.cpp(15) : error C2059: syntax error : 'bad suffix on number'

G:\c语言试水基地\111.cpp(15) : error C2146: syntax error : missing ',' before identifier 'x'

G:\c语言试水基地\111.cpp(16) : error C2059: syntax error : 'bad suffix on number'

G:\c语言试水基地\111.cpp(16) : error C2146: syntax error : missing ';' before identifier 'x'

G:\c语言试水基地\111.cpp(16) : warning C4552: '-' : operator has no effect; expected operator with side-effect

执行 cl.exe 时出错.



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