warning C4244:'=' :conversion from 'double' to 'float',possi

warning C4244:'=' :conversion from 'double' to 'float',possible loss of data,我经常出这样的错误啊,如何判断float和double啊,#include#includeint main(){\x05float a,b,c,disc;\x05scanf("%f%f%f",&a,&b,&c);\x05disc=pow(b,2)-4*a*c;\x05printf("disc=%f",disc);\x05if(disc>0)\x05printf("有两个不相同的实根 ");\x05else if(disc=0)\x05printf("有两个相同实根 ");\x05return 0;}