1.学生成绩统计(一维数组)

#include

#include

int main()

{int a=0;

printf(\" 程序功能如下:\\n \");

printf(\"\\n 1.学生成绩统计（一维数组）\\n\");

printf(\" 2.判断x-y之间有多少个素数，并输出所有素数\\n\");

printf(\" 输入以上对应要求的编号 \");

scanf(\"%d\

if(a==1)

{ float sum=0,ave;

int s[50],num[6]={0};

int i=0,n,j,k;

printf(\"\\n请输入一个班学生人数（全班最多不超过50人）=\");

scanf(\"%d\

printf(\"逐个输入学生的某们成绩\\n \");

for(;i{scanf(\"%d\

sum+=s[i];

ave=sum/n;

if(s[i]<0||s[i]>100)

break;

if(s[i]>=0&&s[i]<60)

num[0]+=1;

if(s[i]>=60&&s[i]<70)

num[1]+=1;

if(s[i]>=70&&s[i]<80)

num[2]+=1;

if(s[i]>=80&&s[i]<90)

num[3]+=1;

if(s[i]>=90)

num[4]+=1;

}

printf(\"\\n 运行结果:\\n \");

printf(\"分数段 学生人数 图形\\n\");

printf(\"=========================================\\n\");

printf(\"<60\%5d(%5.2f%%)\\\

k=num[0]*10/n;

for(j=1;j<=k;j++)

printf(\"*\");

printf(\"\\n\");

printf(\"60-69\%5d(%5.2f%%)\\\

for(j=1;j<=num[1];j++)

printf(\"*\");

printf(\"\\n\");

printf(\"70-79\%5d(%5.2f%%)\\\

for(j=1;j<=num[2];j++)

printf(\"*\");

printf(\"\\n\");

printf(\"80-89\%5d(%5.2f%%)\\\

for(j=1;j<=num[3];j++)

printf(\"*\");

printf(\"\\n\");

printf(\">=90\%5d(%5.2f%%)\\\

for(j=1;j<=num[4];j++)

printf(\"*\");

printf(\"\\n\");

printf(\"=========================================\\n\");

printf(\"不及格人数=\");

printf(\"%d\\n\

printf(\"<60的学生=\");

for(i=0;i{if(s[i]<60)

printf(\"%3d\

printf(\"\\n\");

printf(\"平均分=%f\\n\

for(i=0;i{if(s[i]>=ave)

num[5]++;}

printf(\"成绩在全班平均分及平均分之上的学生人数=\");

printf(\"%d\\n\

printf(\">=平均分的学生=\");

for(i=0;i{if(s[i]>=ave)

printf(\"%3d\

printf(\"\\n\");

return 0;

}

/*题目：判断x-y之间有多少个素数，并输出所有素数。*/

if(a==2)

{ int m,i,k,x,y,h=0,leap=1;

printf(\"\\n请输入x，y的值\");

scanf(\"%d,%d\

printf(\"\\n\");

for(m=x;m<=y;m++)

{k=sqrt(m+1);

for(i=2;i<=k;i++)

if(m%i==0){leap=0;break;}

if(leap){printf(\"%-4d\

h++;

if(h%10==0)printf(\"\\n\");}

leap=1;}

printf(\"\\nThetotalis%d\\n\

else

printf(\"无效输入\\n\");

}