#include <stdio.h>
main()
{
/**/ char /**/ str[20];
int i;
float x;
printf(“Please input a string:\n”);
scanf(“%s”,/**/ &str[i] /**/ );
i=0;
while(str[i])
{
str[i]=/**/ /**/
i++;
}
printf(“\n Target string: %s\n”, str);
getch();
}
/*字符串加密,原则是将每个字符的ASCII码的低四位二进制取反 如输入exam则输出jwnb*/
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