c语言编程问题: printf("%4d",a[i][j]);里面的数字4是起什么作用的？以下文字资料是由(历史新知网www.lishixinzhi.com)小编为大家搜集整理后发布的内容，让我们赶快一起来看一下吧！

c语言编程问题: printf("%4d",a[i][j]);里面的数字4是起什么作用的？

起到固定位数的输出格式。如果该整数小于四位，前面会输出空格

保证四位输出格式，如果该整数大于四位，按正常输出

4 是数组a元素的格式总占4个字符，不够左边加空字符

c语言编程小问题 printf("a=%d",300);输出是什么

%d 代表的是输出的时候以整型输出，a= 原样输出。

这句话的意思呢，就是说吧后边的数字格式化成整型的，也就是后边的(300)

所以：最后输出结果应该是： a=300

printf("%4d",a[m][i][j]);用VB语言怎么表示

void main()

{

int a,b,c,all;

printf("请输入年月日");

scanf("%d%d%d",&a,&b,&c);

if(b==1)

all=c;

if(b==2)

all=31+c;

if(b==3)

all=31+28+c;

if(b==4)

all=31+28+30+c;

if(b==5)

all=c+28+31*2+30;

if(b==6)

all=c+28+31*2+30*2;

if(b==7)

all=c+28+31*3+30*2;

if(b==8)

all=c+28+31*4+30*2;

if(b==9)

all=c+28+31*4+30*3;

if(b==10)

all=c+28+31*5+30*3 ;

if(b==11)

all=c+28+31*5+30*4;

if(b==12)

all=c+28+31*6+30*4;

if(((a%4==0)&&(a%100!=0)||(a%400==0))&&(b>=3) )

all++;

printf("是这一年的第%d天",all);

}

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c语言编程问题，数字直角三角形

main()

{

int i, j, k = 1;

for( j=1 ; j<=4 ; j++ )

{

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

{

if(k==10)

k=0;

printf("%d"k++);

}

printf("\n");

}

}

c语言编程问题 数制转换

#include

#include

long NTOD(long n) /*5进制转换成10进制*/

{

long s;

int i=0;

s=n%10;

while(n!=0){

n=(long)ceil((n-n%10)/10);

i++;

s+=(((long)pow(5,i))*(n%10));

}

return s;

}

int main()

{

long n,m;

do{printf("input a number base 5:\n");

m=scanf("%ld",&n);

printf("%ld\n",NTOD(n));

}while(m);

return 0;

}

C语言编程问题:得票统计

/*在Win_TC软件中编译通过，输入人名按回车键进行投票，输入“result”按回车键查看结果*/

/*By gangjia*/

#include "stdio.h"

#include

main()

{

char People_First[] = {"liu"}; /*候选人1*/

char People_Second[] = {"zhang"}; /*候选人2*/

char People_Third[] = {"wang"}; /*候选人3*/

char Result[] = {"result"};

char People_Temp[20];

int PFirst = 0,PScond = 0,PThird = 0;

while(1)

{

printf("Please input the name:\n"); /*输入候选人姓名*/

scanf("%s",&People_Temp);

if(strcmp(People_Temp,People_First)==0)

{ /*候选人1得票统计*/

PFirst++;

}

if(strcmp(People_Temp,People_Second)==0)

{

PScond++; /*候选人2得票统计*/

}

if(strcmp(People_Temp,People_Third)==0)

{ /*候选人3得票统计*/

PThird++;

}

if(strcmp(People_Temp,Result)==0)

{

printf("\nliu: %d",PFirst);

printf("\nzhang: %d",PScond);

printf("\nwang: %d",PThird);

break;

}

}

getch();

}

C语言编程问题，请用链表哦

看下资料书吧

C语言编程问题 有分加 请进.

/*by HHH*/

#include "stdio.h"

#include "stdlib.h"

#define N 4

struct stu

{

char name[20]; /*姓名*/

long number; /*学号*/

float grade[4]; /*三科成绩*/

};

main()

{

void input (struct stu students[],int n); /*函数声明*/

void average (struct stu students[],int n);

void inorder (struct stu students[],int n);

void output (struct stu students[],int n);

void collect (struct stu students[],int n);

struct stu stud[N];

float row[3];

input (stud,N);

average(stud,N);

inorder(stud,N);

output (stud,N);

collect(stud,N);

}

void input(struct stu students[],int n)

{

int i,j,m;

char temp[30];

for(i=0;i

{

printf("\ninput name,number,english,mathema,physic\n");

gets(students[i].name);

/* gets(temp); */

for(m=0;m<=4;m++)

{

students[0].number=42104101;

students[m+1].number=students[m].number+1;

}

/* students[i].number=atol(temp); */

for(j=0;j<3;j++)

{

gets(temp); /*输入三科成绩*/

students[i].grade[j]=atoi(temp);

}

}

}

/* 求各学生的三科平均成绩*/

void average(struct stu students[],int n)

{

int i,j;

for(i=0;i

{

students[i].grade[3]=0;

for(j=0;j<3;j++)

students[i].grade[3]=students[i].grade[3]+students[i].grade[j];

students[i].grade[3]=students[i].grade[3]/3;

}

}

/*按平均成绩排序，排序算法采用冒泡法*/

void inorder(struct stu students[],int n)

{

struct stu temp;

int i,j,x,y;

for(i=0;i

for(j=0;j

if(students[j].grade[3]>students[j+1].grade[3])

{

temp=students[j];

students[j]=students[j+1];

students[j+1]=temp;

}

}

/*按表格形式输出*/

void output(struct stu students[],int n)

{

int i,j;

printf("**************TABLE*****program*by*HHH***********************\n");

printf("-------------------------------------------------------------\n");

printf("|%10s|%8s|%7s|%7s|%7s|%7s|\n","name","number","english","mathema","physics","averageage");

printf("-------------------------------------------------------------\n");

for(i=0;i

{

printf("|%10s|%8ld|",students[i].name,students[i].number); /*输出姓名 学号*/

for(j=0;j<4;j++)

printf("%7.2f",students[i].grade[j]); /* 输出三科成绩及三科的平均*/

printf("\n");

printf("-------------------------------------------------------------\n");

}

}

/*求学生单科平均成绩并输出。在输出表格的最后一行，输出单科平均成绩及总平均*/

void collect(struct stu students[],int n)

{

float row[4]={0,0,0,0}; /*存放单项平均 */

int i,j;

for(i=0;i

{

for (j=0;j

row[i]=row[i]+students[j].grade[i];

row[i]=row[i]/n; /*计算单项平均 */

}

printf("|%19c|",''); /*按表格形式输出 */

for(i=0;i<4;i++)

printf("%7.2f",row[i]);

printf("\n-------------------------------------------------------------\n");

getch();

}

C语言编程问题，请朋友帮忙！

在TC上调试成功

实现了追加、显示、删除、查找功能；删除功能用c语言不好实现，我采用的是创建一个临时文件，把除符合条件以外的记录都拷贝过去，然后再拷贝回来，最后删除临时文件。

#include "stdio.h"

struct student

{

char name[20];

float score [4];

}stu;

char filename[20]="myfile";

append(char *filename)

{

char ch;

FILE *fp;

fp=fopen(filename,"a");

do{

printf("\nplease input the student's data you want to append:\n");

scanf("%s%f%f%f%f",stu.name,&stu.score[0],&stu.score[1],&stu.score[2],&stu.score[3]);

fseek(fp,0,2);

fwrite(&stu,sizeof(struct student),1,fp);

printf("\ndo you want to continue appending?(y/n)");

getchar();

ch=getchar();

}while(ch!='n');

fclose(fp);

}

list(char *filename)

{

FILE *fp;

fp=fopen(filename,"r");

printf("\nname s1 s2 s3 s4");

printf("\n**************************************");

while(fread(&stu,sizeof(struct student),1,fp)==1)

{

printf("\n%-10s%7.2f%7.2f%7.2f%7.2f",stu.name,stu.score[0],stu.score[1],stu.score[2],stu.score[3]);

}

fclose(fp);

}

seek(char *filename,char *stu_name)

{

FILE *fp;

int s;

fp=fopen(filename,"r");

printf("\n\nname s1 s2 s3 s4");

printf("\n**************************************");

s=fread(&stu,sizeof(struct student),1,fp);

while(s==1)

{

if (strcmp(stu.name,stu_name)==0)

{printf("\n%-10s%7.2f%7.2f%7.2f%7.2f",stu.name,stu.score[0],stu.score[1],stu.score[2],stu.score[3]);}

s=fread(&stu,sizeof(struct student),1,fp);

}

fclose(fp);

}

del(char *filename,char *del_name)

{

FILE *fp;

FILE *temp;

int s;

temp=fopen("temp","w");

fp=fopen(filename,"a+");

s=fread(&stu,sizeof(struct student),1,fp);

while(s==1)

{

if (strcmp(stu.name,del_name)!=0)

fwrite(&stu,sizeof(struct student),1,temp);

s=fread(&stu,sizeof(struct student),1,fp);

}

fclose(fp);

remove(filename);

fp=fopen(filename,"w");

rewind(temp);

s=fread(&stu,sizeof(struct student),1,temp);

while(s==1)

{

fwrite(&stu,sizeof(struct student),1,fp);

s=fread(&stu,sizeof(struct student),1,temp);

}

fclose(fp);

fclose(temp);

remove("temp");

}

main()

{

char stu_name[20],del_name[20];

append(filename);

list(filename);

while (strcmp(stu_name,"quit")!=0)

{

printf("\nplease input the student's name you want to search:(input \"quit\" to exit)");

scanf("%s",stu_name);

seek(filename,stu_name);

}

while (strcmp(del_name,"quit")!=0)

{

printf("\nplease input the student's name you want to delete:(input \"quit\" to exit)");

scanf("%s",del_name);

del(filename,del_name);

list(filename);

}

}

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