EXERCISE - 7 FILES

A) Write a program to print each line of a file in reverse order.
B) Write a program to compute the number of characters, words and lines in a 
file.

A) AIM: Write a program to print each line of a file in reverse order.

SOURCE CODE:

filename=input("Enter file name:\n")
fp1=open(filename,"r")
filedata=fp1.read()
fp1.close()
lines=filedata.split('\n')
for line in lines:
    i=len(line)-1
    while(i>=0):
        print(line[i],end='')
        i=i-1
    print()

OUTPUT:

Enter file name:
msg.txt
ESIR olleH
gnimmargorp nohtyP
margorp eliF si sihT


B) AIM: Write a program to compute the number of characters, words and lines 
in a file.

SOURCE CODE:

filename=input("Enter file name:\n")
fp1=open(filename,"r")
filedata=fp1.read()
fp1.close()
nchars=nwords=nlines=0
for c in filedata:
    if(c):
        nchars=nchars+1
    if(c==' '):
        nwords=nwords+1
    if(c=='\n'):
        nwords=nwords+1
        nlines=nlines+1
print("Number of characters in a file : ",nchars)
print("Number of words in a file : ",nwords)
print("Number of lines in a file : ",nlines)

OUTPUT:

Enter file name:
msg.txt
Number of characters in a file :  51
Number of words in a file :  8
Number of lines in a file :  3