如何交換兩個文字內容的C語言程式碼

　　文字儲存的位置:

位於: e:

位於: e:

　　內容:

-> "Hello! I am Jack."

-> "Hello! I am Retchie."

　相關程式碼程式碼如下:

#include

int main(void)

{

char temp1[100];

char temp2[100];

FILE *p_jack;

FILE *p_retchie;

p_jack = fopen("e:/", "r");

p_retchie = fopen("e:/", "r");

if (p_jack != NULL && p_retchie != NULL)

{

fgets(temp1, 20, p_jack);

fgets(temp2, 20, p_retchie);

}

fclose(p_jack);

fclose(p_retchie);

p_jack = fopen("e:/", "w");

p_retchie = fopen("e:/", "w");

if (p_jack != NULL && p_retchie != NULL)

{

fprintf(p_jack, "%s", temp2);

fprintf(p_retchie, "%s", temp1);

fclose(p_jack);

fclose(p_retchie);

}

return 0;

}

　執行結果:

　　內容:

-> "Hello! I am Retchie."

-> "Hello! I am Jack."