Write a program to change the case of each letter in a file.
#include<stdio.h>
void Change_Case_file(FILE*);
int main()
{
char fileName[50];
FILE *fileptr;
printf("Enter file name : ");
scanf("%[^\n]",fileName);
fileptr = fopen(fileName,"r+");
if(fileptr == NULL)
{
printf("%s File is not present in this directory\n",fileName);
return 0;
}
Change_Case_file(fileptr);
return 0;
}
void Change_Case_file(FILE *p)
{
char ch;
while((ch = fgetc(p)) != EOF)
{
if(((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z')))
{
ch = ch ^ 32;
fseek(p,-1,SEEK_CUR);
fputc(ch,p);
}
}
fclose(p);
printf("Conversion Done....\n");
}
Note: File named data is present in the current working directory.
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Output
Enter file name : data Conversion Done....
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Enter file name : data Conversion Done....
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