#includevoid main(){float a,b;char d;printf("请输入两个数a,b:");scanf("%f,%f"&a,&b);printf("请输入符号d");scanf("%c",d);switch(d){case'+':printf("%f\n,a+b);break;case'-':printf("%f\n,a-b);break;case'*':printf("%f\n,a*b);break;case'/':printf("%f\n,a/b);break;default:printf("input error\n");}}
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