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我使用valgrind通过选项track-origins=yes
来调试我的代码,并发现此错误。未初始化的值是通过堆栈分配创建的 - valgrind
$ valgrind --track-origins=yes ./frgtnlng <in> out
==7098==
==7098== Conditional jump or move depends on uninitialised value(s)
==7098== at 0x4C2F1BC: strcmp (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7098== by 0x400857: main (frgtnlng.c:24)
==7098== Uninitialised value was created by a stack allocation
==7098== at 0x40064C: main (frgtnlng.c:9)
==7098==
==7098== Conditional jump or move depends on uninitialised value(s)
==7098== at 0x40085A: main (frgtnlng.c:24)
==7098== Uninitialised value was created by a stack allocation
==7098== at 0x40064C: main (frgtnlng.c:9)
9号线:
scanf("%d", &t);
我不明白这到底是怎么造成的问题。
frgtnlng.c:
#include <stdio.h>
#include <string.h>
int main(void)
{
int t, n, k, l, i, j, z, out[100];
char f[5][100], m[5][50][50];
scanf("%d", &t);
while (t--) {
for (i = 0; i < 100; i++)
out[i] = 0;
scanf("%d%d", &n, &k);
for (i = 0; i < n; i++)
scanf("%s", f[i]);
for (i = 0; i < k; i++) {
scanf("%d", &l);
for (j = 0; j < l; j++)
scanf("%s", m[i][j]);
}
for (i = 0; i < k; i++)
for (j = 0; j < l; j++)
for (z = 0; z < n; z++) {
if (strcmp(m[i][j], f[z]) == 0)
out[z] = 1;
}
for (i = 0; i < n; i++) {
if (out[i])
printf("YES ");
else
printf("NO ");
}
printf("\n");
}
return 0;
}
在:
2
3 2
piygu ezyfo rzotm
1 piygu
6 tefwz tefwz piygu ezyfo tefwz piygu
4 1
kssdy tjzhy ljzym kegqz
4 kegqz kegqz kegqz vxvyj
包? 'j'从0到'l'独占,因为它小于,不小于或等于。间隔是[0,1)。 – this