Answer Posted / sattwik panda

x=substr(name,1,2) will return first two character of a string whereas substr(name,1,2)='x' will replace first two character by 'x'.
Please try using the code below to get an idea.
data test;
name="Sattwik";
x=substr(name,1,2);
substr(name,1,2)='x';
run;

x will have the first two characters of name:'Sa'.
substr(name,1,2)='x' will replace first two characters of "Sattwik". So, now the name will contain "xttwik".

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