prog.c:4:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
main()
^~~~
prog.c: In function ‘main’:
prog.c:9:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
for(i=0;j=strlen(a)-1;i<=j;i++;j--)
^~~
prog.c:9:25: warning: statement with no effect [-Wunused-value]
for(i=0;j=strlen(a)-1;i<=j;i++;j--)
~^~~
prog.c:9:28: error: expected ‘)’ before ‘;’ token
for(i=0;j=strlen(a)-1;i<=j;i++;j--)
^
prog.c:6:10: warning: unused variable ‘c’ [-Wunused-variable]
int i,j,c;
^