How to convert variables to strings in the C language?

2 years ago
Ava Mitchell
1 minute

In C language, variables can be converted to strings using either the sprintf function or the snprintf function.

  1. Utilize the sprintf function:
#include <stdio.h>

int main() {
    int num = 123;
    char str[10];
    
    sprintf(str, "%d", num);
    printf("字符串: %s\n", str);
    
    return 0;
}
  1. Utilize the snprintf function:
#include <stdio.h>

int main() {
    int num = 123;
    char str[10];
    
    snprintf(str, sizeof(str), "%d", num);
    printf("字符串: %s\n", str);
    
    return 0;
}

The first parameter of these two functions is a character array for storing the converted string. The second parameter is the size of the character array. The third parameter is a formatting string used to define the output format, with %d representing integers. The fourth and subsequent parameters are the variables that need to be converted.

When using the sprintf and snprintf functions, it is important to ensure that the target character array is large enough to accommodate the converted string. Failure to do so may result in buffer overflow issues. It is generally recommended to use the snprintf function and specify the size of the character array to avoid this problem.

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