How to write to a file in c

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#include<stdio.h>

int main(){

        FILE *ptr; //It is file pointer

        char c;

        //opening the file in write mode in Linux os

        ptr = fopen("/root/Test/abc.txt","w");

        //Opening the file in write mode in window os

        // ptr = fopen("C:\\Test\\abc.txt","r");

        //Checking the path is valid or not and printing message

        if(ptr == NULL)

                printf("Error in opening the file");

        else

                printf("File has opened successfully in read mode");

   

    //Write text in the file

    printf("\nEnter text to write in the file and press Esc key to end : ");

    c = getchar();

     while(c!= 27){  //27 is ASCII value of Esc key.

         putc(c,ptr); //Printing one character in file.

         c = getchar();  //getting one character from keybord.

        }

    //Closing the opened file

    fclose(ptr);

    

return 0;

}

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