0_0_25933081_4834.c: In function 'main':
0_0_25933081_4834.c:8:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=0; i<M; ++i)
^
0_0_25933081_4834.c:8:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_25933081_4834.c:10:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int k=0; k<M; ++k)a[i*M][k*M+i]=1;
^
0_0_25933081_4834.c:11:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j=1; j<M; ++j)
^
0_0_25933081_4834.c:14:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int k=1; k<M; ++k)
^
0_0_25933081_4834.c:15:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int l=0; l<M; ++l)
^
0_0_25933081_4834.c:20:10: error: redefinition of 'i'
for(int i=0; i<O; ++i,printf("\n"))
^
0_0_25933081_4834.c:8:10: note: previous definition of 'i' was here
for(int i=0; i<M; ++i)
^
0_0_25933081_4834.c:20:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=0; i<O; ++i,printf("\n"))
^
0_0_25933081_4834.c:21:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j=0; j<O; ++j)printf("%d",a[i][j]);
^
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