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View Compilation Error

0_0_17918998_11452.c: In function 'main':
0_0_17918998_11452.c:26:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;str1[i]!='\0'; i++)
         ^
0_0_17918998_11452.c:26:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17918998_11452.c:31:9: error: unknown type name 'bool'
         bool flag=true;
         ^
0_0_17918998_11452.c:31:19: error: 'true' undeclared (first use in this function)
         bool flag=true;
                   ^
0_0_17918998_11452.c:31:19: note: each undeclared identifier is reported only once for each function it appears in
0_0_17918998_11452.c:32:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int k=9; k>=0; k--)
         ^
0_0_17918998_11452.c:33:21: error: redefinition of 'i'
             for(int i=9; i>=0; i--)
                     ^
0_0_17918998_11452.c:26:17: note: previous definition of 'i' was here
         for(int i=0;str1[i]!='\0'; i++)
                 ^
0_0_17918998_11452.c:33:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int i=9; i>=0; i--)
             ^
0_0_17918998_11452.c:34:17: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
                 for(int j=9; j>=0; j--)
                 ^
0_0_17918998_11452.c:41:38: error: 'false' undeclared (first use in this function)
                                 flag=false;
                                      ^
0_0_17918998_11452.c:68:17: error: redefinition of 'i'
         for(int i=1; i<temp; i++)
                 ^
0_0_17918998_11452.c:33:21: note: previous definition of 'i' was here
             for(int i=9; i>=0; i--)
                     ^
0_0_17918998_11452.c:68:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=1; i<temp; i++)
         ^


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