#include<stdio.h> int main() { int S; scanf("%d",&S); switch(S) { case 90 ... 100: printf("A"); break; case 80 ... 89: printf("B"); break; case 70 ... 79: printf("C"); break; case 60 ... 69: printf("D"); break; case 0 ... 59: printf("E"); break; default: printf("EORR"); }return 0;}

#include<stdio.h>
int main()
{
    int S;
    scanf("%d",&S);
    if(90<=S&&S<=100)
    printf("A");
    else if(80<=S&&S<90)
    printf("B");
    else if(70<=S&&S<80)
    printf("C");
    else if(60<=S&&S<70)
    printf("D");
    else if(0<=S&&S<60)
    printf("E");
    else
    printf("EORR");
    return 0;
}

#include<stdio.h>

int main(){

int S;

scanf("%d",&S);

while(S<0||S>100){

printf("EORR");

return 0;

}

switch(S/10){

case 9 ... 10:printf("A");break;

case 8:printf("B");break;

case 7:printf("C");break;

case 6:printf("D");break;

case 0 ... 5:printf("E");break;

}

return 0;

}

#include <stdio.h>
int main()
{
    int a,b;
    scanf("%d",&a);
    b=a/10;
    if(a==100)printf("A");
    else switch (b)
    {
    case 0:
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:printf("E");break;
    case 6:printf("D");break;
    case 7:printf("C");break;
    case 8:printf("B");break;
    case 9:printf("A");break;

    default:printf("EORR"); break;
    }
    
    return 0;
}//

#include<stdio.h> int main() { int S; scanf("%d",&S); switch(S) { case 90 ... 100: printf("A"); break; case 80 ... 89: printf("B"); break; case 70 ... 79: printf("C"); break; case 60 ... 69: printf("D"); break; case 0 ... 59: printf("E"); break;

default:
	printf("EORR");
	break;		
}

return 0;

}

#include <stdio.h>

int main() { int S;

scanf("%d", &S);
if(90<=S && S<=100){
	printf("A");
}
else if(80<=S && S<90)
{
	printf("B");
}
else if(70<=S && S<80){
	printf("C");
}
else if(60<=S && S<70){
	printf("D");
}
else if(0<=S && S<60){
	printf("E");
}
else{printf("EORR");}
return 0;

}

代码块可以根据语言高亮 '''后接语言名 比如'''cpp

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n>=90&&n<=100) cout<<"A";
    if(n>=80&&n<90) cout<<"B";
    if(n>=70&&n<80) cout<<"C";
    if(n>=60&&n<70) cout<<"D";
    if(n>=0&&n<60) cout<<"E";
    if(n<0||n>100) cout<<"EORR";
}

#include<iostream> using namespace std; int main() {int S; cin>>S; if(90<=S&&S<=100) cout<<"A"; if(80<=S&&S<90) cout<<"B"; if(70<=S&&S<80) cout<<"C"; if(60<=S&&S<70) cout<<"D"; if(0<=S&&S<60) cout<<"E"; if(S<0) cout<<"EORR"; if(S>100) cout<<"EORR"; return 0; }

#include<stdio.h>
int main()
{
    int s;
    scanf("%d",&s);
    if(90<=s<&&s<=100)
    {
        printf("A");

    }
    else if(80<=s&&s<90)
    {
        printf("B");
    }
    else if(70<=s&&s<80)
    {
        printf("C");

    }
    else if(60<=s&&s<70)
    {
        printf("D");

    }
    else if(50<=s&&s<60)
    {
        printf("E");

    }
    else
    printf("EORR");
    return 0; 

}