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The difference between printf, sprintf and fprintf in C (code example)

藏色散人

Release： 2019-04-18 15:44:10

Original

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This article mainly introduces the differences between printf, sprintf and fprintf in C language. I hope it will be helpful to friends in need!

printf:

The printf function is used to print character stream data on the stdout (standard output) console.

Syntax:

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

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Example:

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

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Output:

hello geeksquiz

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sprintf:

Syntax:

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

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sprintf is used to print formatted text (string/character stream) to a string buffer.

Example:

#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; 
}

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Output:

Sum of 10 and 20 is 30

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fprintf:

fprintf is used to print a string in a file content, but does not print on the stdout (standard output) console.

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

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Example:

#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; 
}

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

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Related recommendations: "C Tutorial"

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