02 13 sprintf 格式化、拼接字符串、数字转字符串、二级指针与指针数组 格式化8、16进制

02 13 sprintf

sprintf，输出到空间

01 sprintf 格式化字符串

#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>
#include <string.h>//1、格式化字符串
void test1()
{char buff[100] = { 0 };//printf( "%s", "参军徐赤特");sprintf(buff, "%s", "参军徐赤特");printf("%s\n\n", buff);
}void main() {test1();system("pause");
}

02 sprintf 拼接字符串

#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>
#include <string.h>//2、拼接字符串
void test2()
{//栈区指针指向堆区，字符串常量区拷贝到堆区char* s1 = "辅国将军王仲德";char* s2 = "建威将军孙处";//栈区char s[1024] = { 0 }; memset(s, 0, 1024);sprintf(s, "%s和%s\n", s1, s2);printf("%s\n", s);
}void main() {test2();system("pause");
}

03 sprintf 数字转字符串

#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>
#include <string.h>//3、数字转字符串
void test3() 
{char s[1024] = { 0 };memset(s, 0, 1024);int number = 666;sprintf(s, "%d\n", number);printf("%s\n", s);
}void main() {test3();system("pause");
}

04 sprintf 二级指针给指针数组赋值

#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>
#include <string.h>//4、指针数组
void test4()
{//char* pp[10] = {0};//这样也行//用二级指针指向一级指针数组的头部char** pp = malloc(sizeof(char*)*10);for (int i = 0; i < 10; ++i){pp[i] = malloc(64);//每个pp[i]从0-64字节都初始化memset(pp[i], 0, 64);sprintf(pp[i], "%d", i + 1);}for (int i = 0; i < 10; ++i){printf("%s,", pp[i]);printf("%s,", *(pp+i));}for (int i = 0; i < 10; ++i){if (pp[i]){free(pp[i]);pp[i] = NULL;}}
}void main() {test4();system("pause");
}

05 sprintf 格式化八进制、十六进制

#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>
#include <string.h>//5、格式化八进制、十六进制
void test5()
{char buff[1024] = { 0 };memset(buff, 0, 1024);sprintf(buff, "%o", 666);printf("\n\n%s\n", buff);sprintf(buff, "%x", 666);printf("%s\n", buff);
}
void main() {test5();system("pause");
}