In the below code am getting an error while am assigning len1 to array a
The error is
assignment makes integer from pointer without a
What are the types of the (sub-)expressions in your statement?
a[4] = len1;
len1 is an array of 50 chars (type char[50]) but in the expression above it decays to a pointer to its first element. That's a value of type char*.
a[4] is an object of type char.
You cannot assign a char* to an object of type char!
I think maybe you wanted
/* BEWARE BUFFER OVERFLOWS */
strcpy(a+4, len1); /* a+4 is of type `char*`, len1 decays to `char*` */