C语言及程序设计初步例程-19 字符数据及字符类型

贺老师教学链接  C语言及程序设计初步 本课讲解

字符常量

#include <stdio.h>
int main()
{
    char c1,c2;
    c1='a';
    c2='b';
    printf("%c %c\n", c1, c2);
    return 0;
}

字符当数字用?!

#include <stdio.h>
int main()
{
    char c1,c2;
    int i = 100;
    c1 = 'a';
    i = i - c1;
    printf("c1: %c\n", c1);
    printf("c1: %d, i: %d\n", c1, i);
    c2 = c1 + 4;
    printf("c2: %c\n", c2);
    return 0;
}

字符进行数值运算——ASCII是本质

#include <stdio.h>
int main()
{
    int i,j;
    i='A';
    j='B';
    printf("%d %d\n", i, j);
    printf("i+j=%d\n", i+j);

    char c1, c2;
    c1 = 97;
    c2 = 98;
    printf("%c %c\n", c1, c2);
    printf("%c %d\n", c1-32, c2-32);
    return 0;
}

获得缓存区中的输入数据（运行时，分别输入abc<回车>和a<回车>查看结果）

#include <stdio.h>
int main()
{
    char c1,c2;
    c1=getchar();
    c2=getchar();
    printf("%c %c\n", c1, c2);
    printf("%d %d\n", c1, c2);
    return 0;
}

转义字符用法示例

#include <stdio.h>
int main()
{
    printf("%.4f%.4f%.4f\n", 1.01, 2.2334, 3.4);
    printf("col1\tcol2\tcol3\n");
    printf("%.4f\t%.4f\t%.4f\n",1.01, 2.2334, 3.4);

    printf("This\nis\na\n\t\ttest\n\nShe said, \"How are you?\"\n");
    return 0;
}

趣味转义字符

#include <stdio.h>
int main()
{
	printf("笑脸：\001\n");
	printf("红黑桃：\003  \006\n");
	printf("听个响：\a\n");
	printf("换几行：a\012 b\n c\x0A d\n");
	printf("看字母：AB\n");
	printf("再看字母：\101\102\n");
	printf("再看字母：\101\b\102\n");
	printf("还看字母：\101\r\102\n");
   return 0;
}