Stdio
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<![CDATA[
#include <stdio.h>
int main(void)
{
char st[80] = "B456";
int ch, dt;
sscanf(st, "%c%d", &ch, &dt);
printf("ch=%c dt=%d\n", ch, dt);
return 0;
}
/*
char st[80] = 'B456';
error C2075: 'st' : 配列の初期化には中ｶｯｺ ({}) が必要です。
运行结果
ch=B dt=456
*/
#include <stdio.h>
int main(void)
{
char st[80];
double n;
sprintf(st, "%c%c%d", 33,66,123);
puts(st);
return 0;
}
/*
运行结果
!B123
*/
#include <stdio.h>
int main(void)
{
int idt;
long ldt;
float fdt;
double ddt;
char sdt[80];
scanf("%d", &idt);
printf("Your input int number is %d\n",idt);
scanf("%ld", &ldt);
printf("Your input long number is %ld\n",ldt);
scanf("%f", &fdt);
printf("Your input float number is %f\n",fdt);
scanf("%lf", &ddt);
printf("Your input double number is %lf\n",ddt);
scanf("%s", sdt);
printf("Your input char is %s\n",sdt);
return 0;
}
/*
运行结果
3
Your input int number is 3
99
Your input long number is 99
3.14
Your input float number is 3.140000
3.14
Your input double number is 3.140000
This_is_the_test.
Your input char is This_is_the_test.
*/
// 拥有混合数据型数据的函数
#include <stdio.h>
#include <stdarg.h>
void unidisp(char *fmt, ...);
int main(void)
{
unidisp("iiii", 101, 202, 303,404);
unidisp("idsids", 99, 22.22, "aaaa", 33, 44.44, "bbbb");
return 0;
}
void unidisp(char *fmt, ...)
{
va_list ap;
va_start(ap,fmt);
while(*fmt) {
if (*fmt == 'i') printf("%d\n", va_arg(ap,int));
if (*fmt == 'd') printf("%f\n", va_arg(ap,double));
if (*fmt == 's') printf("%s\n", va_arg(ap,char *));
++fmt;
}
va_end(ap);
}
/*
运行结果
C:\VC6prg\c2pro>list17_7
101
202
303
404
99
22.220000
aaaa
33
44.440000
bbbb
*/
]]>
如何取得日期和时间
<![CDATA[
#include <stdio.h>
#include <time.h>
int main()
{
time_t now;
time(&now);
printf("It's %s", ctime(&now));
return 0;
}
/*
C:\>test080811
It's Mon Aug 11 16:30:01 2008
*/
]]>
shift
<![CDATA[
#include <stdio.h>
int main(void)
{
short int a;
unsigned short int u;
int dt;
a = 0xAAAA;
printf("First value is %04hX\n", a);
a = a << 1;
printf("Left shift is %04hX\n", a);
a = 0xAAAA;
a = a >> 1;
printf("Sign right shift is %04hX\n", a);
u = 0xAAAA;
u = u >> 1;
printf("No sign right shift is %04hX\n", u);
dt = 88888888;
printf("First value is %d\n", dt);
dt = dt << 2;
printf("Left 2 shift is %d\n", dt);
dt = dt >> 1;
printf("Right 1 shift is %d\n", dt);
dt = -88888888;
printf("First value is %d\n", dt);
dt = dt << 2;
printf("Left 2 shift is %d\n", dt);
dt = dt >> 1;
printf("Right 1 shift is %d\n", dt);
return 0;
}
/*
First value is AAAA
Left shift is 5554
Sign right shift is D555
No sign right shift is 5555
First value is 88888888
Left 2 shift is 355555552
Right 1 shift is 177777776
First value is -88888888
Left 2 shift is -355555552
Right 1 shift is -177777776
*/
]]>
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