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printf("toM=");

scanf("%d",&toM);

if(toM==0)

printf("错误，除数不能为0\n");

else

{

result=arith_compliment(toN,toM);

printf("\n%d",toN);

printf("%%");

printf("%d=%d\n",toM,result);

};

break;

case 6:

printf("请输入toN和toM(num1>num2)：\n");

scanf("%d%d",&toN,toM);

result=addFromNToM(toN,toM);

printf("%d至%d的累加为%d\n",toN,toM,result);

break;

case 7:

printf("请输入toN：\n");

printf("toN=");

scanf("%d",&toN);

result=factorial(toN);

printf("%d的阶乘为%d\n",toN,result);

break;

case 8:

exit(0);

}

}

}

double add(double para1, double para2)

{

double result;

result=para1+para2;

return result;

}

double sub(double para1, double para2)

{

double result;

result=para1-para2;

return result;

}

double multi(double para1, double para2)

{

double result;

result=para1*para2;

return result;

}

double divide(double para1, double para2)

{

double result;

result=para1/para2;

return result;

}

int arith_compliment(int toN, int toM)

{

int result;

result=toN%toM;

return result;

}

int addFromNToM(int toN,int toM)

{

int result=0;

int tmp,index;

if(toN>toM)

{

tmp=toN;toN=toM;toN=tmp;

}

for(index=toN;index<=toM;index++)

{

result+=index;

}

return result;

}

int factorial(int toN)

{

int result;

int i;

result=1;

for(i=1;i<=toN;i++)

result=result*i;

return result;

}

void displaymenu()

{

printf("+++++++++++++++++++++++++++++\n");

printf("+          1、加法            +\n");

printf("+          2、减法            +\n");

printf("+          3、乘法            +\n");

printf("+          4、除法            +\n");

printf("+          5、求余            +\n");

printf("+          6、累加            +\n");

printf("+          7、阶乘            +\n");

printf("+          8、结束            +\n");

printf("+++++++++++++++++++++++++++++\n");

}