打印字符串有困难 [英] Having difficulty printing strings

问题描述

当我运行程序时，第二个printf()打印string2，并将扫描到的string1中的任何内容附加到末尾.

When I run the program, the second printf() prints string2 with whatever was scanned into string1 attached to the end.

例如将123扫描到string1中，然后打印:Is before "12ab123". 与12ab相对.

e.g. 123 was scanned into string1 then it prints: Is before "12ab123". as opposed to 12ab.

为什么不只是"12ab"?

char string1[MAX_STR_LEN];
char string2[4]={'1','2','a','b'};
char five='5';
char abc[3]={'a','b','c'};
printf("Enter a string:");
scanf("%s", string1);
printf("Is before \"%s\":",string2);

推荐答案

字符串是C中以null结尾的char数组.

A string is a null terminated char array in C.

更改

char string2[4]={'1','2','a','b'};

到

char string2[5]={'1','2','a','b', '\0'};

(与char string2[] = "12ab";相同)

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