C语言中常用的输入输出函数包括printf、scanf、getchar、putchar、gets、puts、fopen、fclose、fgetc、fputc、fgets、fputs等。
#include
int main()
{
int num = 10;
printf("The number is %d\n", num);
return 0;
}
#include
int main()
{
int num;
printf("Enter a number: ");
scanf("%d", &num);
printf("You entered: %d\n", num);
return 0;
}
#include
int main()
{
char ch;
printf("Enter a character: ");
ch = getchar();
printf("You entered: %c\n", ch);
return 0;
}
#include
int main()
{
char ch = 'A';
putchar(ch);
return 0;
}
#include
int main()
{
char str[100];
printf("Enter a string: ");
gets(str);
printf("You entered: %s\n", str);
return 0;
}
#include
int main()
{
char str[] = "Hello, World!";
puts(str);
return 0;
}
#include
int main()
{
FILE *file = fopen("example.txt", "r");
if (file == NULL)
{
printf("File not found\n");
return 1;
}
// 文件操作
fclose(file);
return 0;
}
#include
int main()
{
FILE *file = fopen("example.txt", "r");
if (file == NULL)
{
printf("File not found\n");
return 1;
}
// 文件操作
fclose(file);
return 0;
}
#include
int main()
{
FILE *file = fopen("example.txt", "r");
if (file == NULL)
{
printf("File not found\n");
return 1;
}
char ch = fgetc(file);
printf("Character read from file: %c\n", ch);
fclose(file);
return 0;
}
#include
int main()
{
FILE *file = fopen("example.txt", "w");
if (file == NULL)
{
printf("File not found\n");
return 1;
}
char ch = 'A';
fputc(ch, file);
fclose(file);
return 0;
}
#include
int main()
{
FILE *file = fopen("example.txt", "r");
if (file == NULL)
{
printf("File not found\n");
return 1;
}
char str[100];
fgets(str, 100, file);
printf("String read from file: %s\n", str);
fclose(file);
return 0;
}
#include
int main()
{
FILE *file = fopen("example.txt", "w");
if (file == NULL)
{
printf("File not found\n");
return 1;
}
char str[] = "Hello, World!";
fputs(str, file);
fclose(file);
return 0;
}
这些是C语言中常用的输入输出函数和相应的示例代码。请注意,部分函数在C11标准中被认为是不安全的,并且在某些编译器中可能会引起警告或错误。如果遇到问题,请查阅相关文档或使用更安全的函数替代。