0_0_19923062_7972.c: In function 'new_node':
0_0_19923062_7972.c:7:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < 26; i++)
^
0_0_19923062_7972.c:7:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_19923062_7972.c: In function 'update':
0_0_19923062_7972.c:20:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < 2; i++) {
^
0_0_19923062_7972.c:22:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int j = 1; j > i; j--)
^
0_0_19923062_7972.c: In function 'insert':
0_0_19923062_7972.c:32:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; str[i] != '\0'; i++) {
^
0_0_19923062_7972.c: In function 'sum':
0_0_19923062_7972.c:43:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < cnt; i++) {
^
0_0_19923062_7972.c: In function 'main':
0_0_19923062_7972.c:58:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < n; i++) {
^
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