C语言函数大全（s开头）（1）

C语言函数大全（s开头）（1）2010-01-29函数名: sbrk

功能: 改变数据段空间位置

用法: char *sbrk（int incr）;

程序例:

#include
#include
int main（void）
{
printf（"Changing allocation with sbrk（）
"）;
printf（"Before sbrk（） call: %lu bytes free
",
（unsigned long） coreleft（））;
sbrk（1000）;
printf（" After sbrk（） call: %lu bytes free
",
（unsigned long） coreleft（））;
return 0;
}

函数名: scanf

功能: 执行格式化输入

用法: int scanf（char *format[,argument,...]）;

程序例:

#include
#include
int main（void）
{
char label[20];
char name[20];
int entries = 0;
int loop, age;
double salary;
struct Entry_struct
{
char name[20];
int age;
float salary;
} entry[20];
/* Input a label as a string of characters restricting to 20 characters */
printf（"

Please enter a label for the chart: "）;
scanf（"%20s", label）;
fflush（stdin）; /* flush the input stream in case of bad input */
/* Input number of entries as an integer */
printf（"How many entries will there be？ （less than 20） "）;
scanf（"%d", &entries）;
fflush（stdin）; /* flush the input stream in case of bad input */
/* input a name restricting input to only letters upper or lower case */
for （loop=0;loop
{
printf（"Entry %d
", loop）;
printf（" Name : "）;
scanf（"%[A-Za-z]", entry[loop].name）;
fflush（stdin）; /* flush the input stream in case of bad input */
/* input an age as an integer */
printf（" Age : "）;
scanf（"%d", &entry[loop].age）;
fflush（stdin）; /* flush the input stream in case of bad input */
/* input a salary as a float */
printf（" Salary : "）;
scanf（"%f", &entry[loop].salary）;
fflush（stdin）; /* flush the input stream in case of bad input */
}
/* Input a name, age and salary as a string, integer, and double */
printf（"
Please enter your name, age and salary
"）;
scanf（"%20s %d %lf", name, &age, &salary）;

/* Print out the data that was input */
printf（"

Table %s
",label）;
printf（"Compiled by %s age %d $%15.2lf
", name, age, salary）;
printf（"-----------------------------------------------------
"）;
for （loop=0;loop
printf（"%4d | %-20s | %5d | %15.2lf
",
loop + 1,
entry[loop].name,
entry[loop].age,
entry[loop].salary）;
printf（"-----------------------------------------------------
"）;
return 0;
}