C-Lang-Class1-SlideShare

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printf

1 1
#include<stdio.h>
int main(void) {
printf("Hello¥n");
printf("world¥n");
return 0;
}

printf
#include<stdio.h>
int main(void) {
printf("Hello¥n");
printf("world¥n");
return 0;
}

#include<stdio.h>
•
• printf
• scanf
•
• <stdlib.h>:
• <time.h>:

printf ( )
staticvoidput_integer(void(*__putc)(int),unsignedlonglongn,intradix,intlength,charsign,intflags)
{
staticchar*symbols_s="0123456789abcdef";
staticchar*symbols_c="0123456789ABCDEF";
charbuf[80];
inti=0;
intpad=' ';
char*symbols=symbols_s;
if(flags&CAPITAL_LETTER)symbols=symbols_c;
do{
buf[i++]=symbols[n%radix];
if((flags&THOUSAND_GROUP)&&(i%4)==3)buf[i++]=',';
}while(n/=radix);
length-=i;
if(!(flags&LEFT_JUSTIFIED)){
if(flags&ZERO_PADDING)pad='0';
while(length>0){length--;buf[i++]=pad;}
}
if(sign&&radix==10)buf[i++]=sign;
if(flags&ALTERNATIVE)
{
if(radix==8)buf[i++]='0';
elseif(radix==16)
{
buf[i++]='x';
buf[i++]='0';
}
}
while( i>0){__putc(buf[--i]); }
while(length>0){length--;__putc(pad);}
}

#include<stdio.h>
int main(void) {
printf("Hello¥n");
printf("world¥n");
return 0;
}

• ¥n:
• ¥t:
• ¥’: (‘)
• ¥”: (“)
• ¥?: (?)
Windows (¥)Mac ( )

#include<stdio.h>
int main(void){
int x,y;
x =10;
y = x * 10 + 20;
printf("%5d¥n",y);
return 0;
}

• int ; :
• float ; :32bit
• double ; :64bit
• char ; : (1 )

• = ;
•
•
• int x = 190;
• (?)

• %d : 10
• %f :
• %c :1
• %s : ( )
• % .
C

#include<stdio.h>
int main(void){
int data1, data2;
scanf("%d,%d",&data1,&data2);
/* */
printf("%d , %d¥n",data1,data2);
return 0;
}

• scanf <stdio.h> #include
• 10
• %d
• &
•

C-Lang-Class1-SlideShare

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