连续 if 语句流程

Question

if (srcbloc == NULL) {
    fprintf(stderr, "warning!: memrip source is null!\n");
    exit(1);
}
if (destbloc == NULL) {
    destbloc = malloc(len);
}
if (srcbloc == destbloc) {
    fprintf(stderr, "warning!: srcbloc = destbloc\n");
    exit(1);
}
if (offset < 0) {
    fprintf(stderr, "warning!: offset = %i\n", offset);
}
if (len < 0) {
    fprintf(stderr, "warning!: len = %i\n", len);
}

我想知道当这个程序运行时是否会测试所有的 if 语句？

Answer 1

给定您的代码

if (srcbloc == NULL) { /* <-- if this block is entered then, */
  fprintf(stderr, "warning!: memrip source is null!\n"); 
  exit(1); /* <-- Program will exit */ 
}
if (destbloc == NULL) {  /* <-- Allocate destbloc of len length. */
  destbloc = malloc(len); 
}
if (srcbloc == destbloc) { /* <-- if this block is entered then, */
  fprintf(stderr, "warning!: srcbloc = destbloc\n"); 
  exit(1); /* <-- Program will exit */ 
}
if (offset < 0) { 
  fprintf(stderr, "warning!: offset = %i\n", offset); 
}
if (len < 0) { 
  fprintf(stderr, "warning!: len = %i\n", len); 
}

因此，如果 (srcbloc == NULL) 或 (srcbloc == destbloc) 程序将发出警告(并退出)。如果任何其他测试匹配，将打印警告，但程序将继续处理。