while
do… while
for
[=]
5
5
#include <stdio.h>
void main()
{
int a1,a2,a3,a4,a5;
int sum=0;
printf("a1");
scanf("%d",&a1);
printf("a2");
scanf("%d",&a2);
printf("a3");
scanf("%d",&a3);
printf("a4");
scanf("%d",&a4);
printf("a5");
scanf("%d",&a5);
sum=a1+a2+a3+a4+a5;
printf("sum=%d\n",sum);
}
#include <stdio.h>
void main()
{
int a,sum=0;
int i;
for (i=1;i<=5;i++)
{
printf("a%d",i);
scanf("%d",&a);
sum+=a;
}
printf("sum=%d\n",sum);
}
#include <stdio.h>
void main()
{
int a[5];
int i,sum=0;
for (i=0;i<5;i++)
{
printf("a[%d]",i);
scanf("%d",&a[i]);
sum+=a[i];
}
for (i=0;i<5;i++)
{
printf("a[%d]=%d\n",i,a[i]);
}
printf("sum=%d\n",sum);
}
intfloatdoublechar
8
12
3
Int a[5]={1,2,3,4,5}
Int a[5];int[0]=1;int[1]=2
Int a[5]={1,2,3}
Int a[]={1234}
[]
a[0]a[5]
0N-1
a[10]a[0],a[1]…… a[8],a[9]
int a[3]={4,8,9};
a[0]=4;a[1]=8;a[2]=9;
char b[]={?c?,?h?,?i?,?n?,?a?};
b[0]=?c? b[1]=?h?,b[2]=?i?,b[3]=?n?,b[4]=?a?
#include <stdio.h>
void main()
{
int a[5]; //5
int i;
for (i=0;i<5;i++)
{
printf("a[%d]:",i);
scanf("%d",&a[i]);
} //
printf("-----------\n");
for (i=4;i>=0;i--)
{
printf("a[%d]=%d\n",i,a[i]);
} //
}
51020304050
5
5
—
[][]
int a[2][3]
1
a[2][3]={{1,2,3},{4,5,6}}
2
a[2][3]={1,2,3,4,5,6}
3
a[2][3]={{5},{6}}
[][]
4*3
J ulia 45 60 90
Ben 20 67 92
Nicho la s 90 35 56
De m i 78 50 80
int a[4][3]a[0][0];a[1][2];a[3][3];a[4][1]
1 2 3
4 5 6
1 4
2 5
3 6
a b
#include <stdio.h>
void main()
{
int a[2][3]={{1,2,3},{4,5,6}};//
int i,j;
for (i=0;i<2;++i)
{
for (j=0;j<3;j++)
{
printf("%d\t",a[i][j]);
} //
putchar('\n');
}
putchar('\n');
for (j=0;j<3;j++)
{
for (i=0;i<2;i++)
{
printf("%d\t",a[i][j]);
}//
putchar('\n');
}
}
6 1 8
7 5 3
2 9 4
char []
char ch[10]
1char ch[9]={?a?,?b?,?c?,?d?,?e?,?f?,?g?,?h?};
2char ch[8]=“chinese”;
#include <stdio.h>
void main()
{
char ary[5];
int i;
printf("\n Enter string,");
scanf(“%s”,ary); //
printf(“\n The string is %s \n\n”,ary); //
for (i=0; i<5; i++)
printf("\t%d",ary[i]);
}
—
char ch[]=,china” ()
#include <stdio.h>
void main()
{
char name[10];
char sex[3];
printf(" ");
scanf("%s",name);
printf(" ");
scanf("%s",sex);
printf(" %s\t",name);
printf(" %s\n",sex);
}
char [5][10]
5:
5
10:
10
puts
puts( )
gets
gets ( )
#include <stdio.h>
#include <string.h>
void main()
{
char ch[20];
gets(ch);
puts(ch);
}
()
strcpy
Strcpy(12)
21
include <stdio.h>
#include <string.h>
void main()
{
char a[10],[b]={"china"};
strcpy(a,b);
puts(a);
}
()
strcat
strcat( 12)
21
#include <stdio.h>
#include <string.h>
void main()
{
char a[12]={"leaf"};
char b[6]={"apple"};
strcat(a,b);
puts(a);
}
()
Strcmp
Strcmp( 12)
12ASCII
1>2>0
1=2=0
1<2<0
strcmp
#include <stdio.h>
#include <string.h>
void main()
{
char a[10]="china";
char b[6]="apple";
int c;
c=strcmp(a,b);
printf("%d\n",c);
}
()
strlen
strlen( )
strupr
strupr( )
5
