View Compilation Error

0_0_23595942_7508.c: In function 'main':
0_0_23595942_7508.c:16:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < m; i++)
   ^
0_0_23595942_7508.c:16:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_23595942_7508.c:21:7: error: redeclaration of 'i' with no linkage
   int i, j;
       ^
0_0_23595942_7508.c:16:12: note: previous definition of 'i' was here
   for (int i = 0; i < m; i++)
            ^