#include<stdio.h>

int main()
{
    int R,S;
    printf("请输入清晰度：");
    scanf("%d",&R);
    printf("请输入大小：");
    scanf("%d",&S);
   
    swich(S){
        case 1:
        printf("Faint signals, barely perceptibl,");
        break;
        case 2:
        printf("Very weak signals,");
        break;
        case 3:
        printf("Weak signals,");
        break;
        case 4:
        printf("Fair signals,");
        break;
        case 5:
        printf("Fairly good signals,");
        break;
        case 6:
        printf("Good signals,");
        break;
        case 7:
        printf("Moderately strong signals,");
        break;
        case 8:
        printf("Strong signals,");
        break;
        default:
        printf("Extremely strong signals,");
        break;   
    }
   
    swich(R){
        case 1:
        printf("Unreadable.");
        break;
        case 2:
        printf("Barely readable, occasional words distinguishable.");
        break;
        case 3:
        printf("Readable with considerable difficulty.");
        break;
        case 4:
        printf("Readable with practically no difficulty.");
        break;
        default:
        printf("Perfectly readable.");
        break;   
    }
   
   
    return 0;
}

提示错误：In function 'main':
      11 列    10行        [Error] expected ';' before '{' token