1-5 #include int main ( ){ printf ("**************************\n\n"); printf(" Very Good!\n\n"); printf ("**************************\n"); return 0;}1-6#include int main(){int a,b,c,max; printf("please input a,b,c:\n"); scanf("%d,%d,%d",&a,&b,&c); max=a; if (maxint main(){ int a,b,c; printf("请输入三个整数:"); scanf("%d,%d,%d",&a,&b,&c); if (aint main(){ int x,y; printf("输入 x:"); scanf("%d",&x); if(x<1) /* x<1 */ { y=x; printf("x=%3d, y=x=%d\n" ,x,y); } else if(x<10) /* 1==10 */{ y=3*x-11; printf("x=%d, y=3*x-11=%d\n",x,y);} return 0;}4-7-1#include int main(){ int x,y; printf("enter x:"); scanf("%d",&x); y=-1; if(x!=0) if(x>0) y=1; else y=0; printf("x=%d,y=%d\n",x,y); return 0;}4-7-2#include int main(){ int x,y; printf("please enter x:"); scanf("%d",&x); y=0; if(x>=0) if(x>0) y=1; else y=-1; printf("x=%d,y=%d\n",x,y); return 0;}4-8#include int main() { float score; char grade; printf("请输入学生成绩:"); scanf("%f",&score); while (score>100||score<0){printf("\n 输入有误,请重输");scanf("%f",&score);} switch((int)(score/10)) {case 10:case 9: grade='A';break;case 8: grade='B';break;case 7: grade='C';break;case 6: grade='D';break;case 5:case 4:case 3:case 2:case 1:case 0: grade='E';} printf("成绩是 %5.1f,相应的等级是%c\n ",score,grade);return 0;}4-11#include int main() {int t,a,b,c,d; printf("请输入四个数:"); scanf("%d,%d,%d,%d",&a,&b,&c,&d); printf("a=%d,b=%d,c=%d,d=%d\n",a,b,c,d); if (a>b) { t=a;a=b;b=t;} if (a>c) { t=a;a=c;c=...
