C中printf、sprintf和fprintf的区别（代码示例）

int printf(const char* str, ...);

#include<stdio.h> 
int main() 
{ 
   printf("hello geeksquiz"); 
   return 0; 
}

hello geeksquiz

int sprintf(char *str, const char *string,...);

#include<stdio.h> 
int main() 
{ 
    char buffer[50]; 
    int a = 10, b = 20, c; 
    c = a + b; 
    sprintf(buffer, "Sum of %d and %d is %d", a, b, c); 
    printf("%s", buffer); 
  
    return 0; 
}

Sum of 10 and 20 is 30

int fprintf(FILE *fptr, const char *str, ...);

#include<stdio.h> 
int main() 
{ 
    int i, n=2; 
    char str[50]; 
  
    FILE *fptr = fopen("sample.txt", "w"); 
    if (fptr == NULL) 
    { 
        printf("Could not open file"); 
        return 0; 
    } 
  
    for (i=0; i<n; i++) 
    { 
        puts("Enter a name"); 
        gets(str); 
        fprintf(fptr,"%d.%s\n", i, str); 
    } 
    fclose(fptr); 
  
    return 0; 
}

输入: GeeksforGeeks
       GeeksQuiz
输出:  sample.txt file now having output as 
0. GeeksforGeeks
1. GeeksQuiz