0_0_28023078_21468.c: In function 'main':
0_0_28023078_21468.c:11:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i = 0;i < n;i++){
^
0_0_28023078_21468.c:11:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_28023078_21468.c:15:10: error: redefinition of 'i'
for(int i = 0;i < m;i++){
^
0_0_28023078_21468.c:11:10: note: previous definition of 'i' was here
for(int i = 0;i < n;i++){
^
0_0_28023078_21468.c:15:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i = 0;i < m;i++){
^
0_0_28023078_21468.c:25:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i = 0;i < n;i++){
^
0_0_28023078_21468.c:26:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j = 0;j < m;j++){
^
0_0_28023078_21468.c: In function 'exchange':
0_0_28023078_21468.c:50:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j = i+1;j < n;j++){
^
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