A.（1）#include<stdio.h>
int sum=0;
int OddSum(int n)
{
if(n%2)
sum+=n;
return sum;
}
int main()//求几个数中所有奇数的和
{
int Sum,n,i,answer;
printf("请输入n的值:");
scanf("%d",&n);
printf("请输入，每个值用空格隔开
");
for(i=0;i<n;i++)
{
scanf("%d",&Sum);
answer=OddSum(Sum);
}
printf("%d个整数中所有的奇数和为%d
",n,answer);
return 0;
}
B.学生管理系统
#include<stdio.h>
void f1()//
{ int n;
printf("请输入该名学生学号后两位:
");
scanf("%d",&n);
switch(n){//第二层次
case 01:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)//第三层次
{
case 1:
printf("
");//把作业内容复制粘贴进去即可，以下雷同。
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 02:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 03:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
}
}
void f2()
{ int n;
printf("请输入该名学生学号后两位:
");
scanf("%d",&n);
switch(n){
case 01:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 02:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 03:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
}
}
void f3()
{ int n;
printf("请输入该名学生学号后两位:
");
scanf("%d",&n);
switch(n){
case 01:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 02:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 03:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
}
}
void f4()
{ int n;
printf("请输入该名学生学号后两位:
");
scanf("%d",&n);
switch(n){
case 01:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 02:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 03:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
}
}
void f5()
{ int n;
printf("请输入该名学生学号后两位:
");
scanf("%d",&n);
switch(n){
case 01:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 02:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
case 03:
printf(" 1.作业1
");
printf(" 2.作业2
");
printf(" 3.作业3
");
printf(" 4.作业4
");
printf(" 5.作业5
");
printf(" 6.作业6
");
{
int choice;
switch(choice)
{
case 1:
printf("
");
break;
case 2:
printf("
");
break;
case 3:
printf("
");
break;
case 4:
printf("
");
break;
case 5:
printf("
");
break;
case 6:
printf("
");
break;
}
}
break;
}
}
int main()
{ int flag=0;
do{
int choice;
printf(" 计科三班学生作业管理系统
");
printf(" 1.第一次作业
");
printf(" 2.第二次作业
");
printf(" 3.第三次作业
");
printf(" 4.第四次作业
");
printf(" 5.第五次作业
");
printf(" 0.退出，
");
printf("请输入你的选择:
");
scanf("%d,&flag");
switch(flag){//第一层次
case 0: break;
case 1: f1(); break;
case 2: f2(); break;
case 3: f3(); break;
case 4: f4(); break;
case 5: f5(); break;
default: break;
}
}while(flag!=0);
return 0;
}