#includeint main(){ float a,b,s; char t, w; printf("欢迎使用本计算器！\n"); scanf("%f%c%f",&a,&t,&b); switch(t){ case'+': s=a+b; break; case'-': s=a-b; break; case'*': s=a*b; break; case'/': s=a/b; break; default: break;} scanf("%c", &w); if ('=' == w) {
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