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C语言基本数据类型有9种:整形int,长整形long，短整型short，字符型char,实型：单精型（float型）、双精度（double），void，有符号signed，无符号unsigned。
在32位编译器下，各数据类型所占字节如下：
printf("int占%d个字节\n", sizeof(int)); printf("float占%d个字节\n", sizeof(float));
printf("double占%d个字节\n", sizeof(double)); printf("char占%d个字节\n", sizeof(char));
printf("long占%d个字节\n", sizeof(long)); printf("short占%d个字节\n", sizeof(short));
输出结果如下：
int占4个字节 float占4个字节 double占8个字节 char占1个字节 long占4个字节 short占2个字节
各数据类型输出形式如下：
int a = 1; float b = 1.0; double c = 1.0; char ch = 'A'; long d = 1; printf("a
= %d,b = %f,c = %lf,ch = %c,d = %ld", a, b, c, ch, d);
此外，float，double保留n位小数表示：%.nf,%.nlf.
还有%md：m指定位输出数据的最小宽度。若数据位数小于m，这向左端补空格，若大于等于m，则按实际位数输出，此时可以配合修饰符“-”和“0”加以控制，如下：
int a = 1234; printf("%d\n", a); printf("%3d\n", a); printf("%8d\n", a);
printf("%08d\n", a); printf("%-8d\n", a);
输出结果如下：
1234 1234 1234 00001234 1234
仔细观察区别与特点。
此处简介到此结束啦！！！
