句法：
int sprintf(char *str, const char *string,...);
返回：
If successful,
it returns the total number of
characters written excluding
null-character appended in the string,
in case of failure a negative number
is returned .
sprintf代表“字符串打印”。它将输出存储在sprintf中指定的char缓冲区中，而不是在控制台上进行打印。
C
// Example program to demonstrate sprintf()
#include
int main()
{
char buffer[50];
int a = 10, b = 20, c;
c = a + b;
sprintf(buffer, "Sum of %d and %d is %d", a, b, c);
// The string "sum of 10 and 20 is 30" is stored
// into buffer instead of printing on stdout
printf("%s", buffer);
return 0;
} 输出
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