第一题：main(){ int a,b; scanf("%d%d",&a,&b); printf("a+b=%da-b=%da*b=%da/b=%da%b=%d\n",a+b,a-b,a*b,a/b,a%b);}第二题：main(){int a,i,sum;scanf("%d",&a);for(i=1;ivoid main(){float a,b,t;printf("input two numbers:\n");scanf("%f,%f",&a,&b);t=a+b;printf("%.2f\n",t);t=a-b;printf("%.2f\n",t);t=a*b;printf("%.2f\n",t);t=(float)a/b;printf("%.2f\n",t);t=(int)a%(int)b;printf("%.2f\n",t);}
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