c语言输入三个成绩,然后转化为等级输出,请使用函数。答:int main(int argc,char **argv){ int a,b,c;char A,B,C printf("请输入三个成绩:\n");scanf("%d",&a);scanf("%d",&b);scanf("%d",&c);if(a>=90) strcpy(A,"A");if(a>=80) strcpy(A,"B");if(a>=70) strcpy(A,"C");if(a>=60) strcpy(A,"D");if(b>=90...