头文件不能工作-undefined引用`method’
头文件似乎无法正常工作。 我是C的新手，并不知道我在做什么
error - findvals.c:(.text+0x561): undefined reference to `approxEqual' findvals.c
#include #include #include #include #include "utils.h" int main(int argc, char **argv) { //printf("GRR ENTAR SOMETHANG"); //char word[64]; //scanf("%s", word); int count = 0; int ret; double x; double y; int i = 0; int c = 0; char *refStr, *tolStr; double refDub; double tolDub; int noArgs = 0; //double temp; //scanf("%lf" , &temp); //printf("DUBBB %lf" , temp); refStr = tolStr = NULL; //Add code to read arguments, in ANY order ie -r can come before or after -t int processCount = 0; for(i = 1; i < 5; i++) { if (strcmp(argv[i], "-r")) { tolStr = argv[i+1]; i++; //printf("\nIM HERE r"); } else if (strcmp(argv[i], "-t")) { refStr = argv[i+1]; i++; //printf("\nIM HERE t"); } } refDub = atof(refStr); tolDub = atof(tolStr); //printf("\nrefDub = %f", refDub); //printf("\ntolDub = %f", tolDub); //Check if arguments were passed in correctly. if (argc != 5 || refStr == NULL || tolStr == NULL) { fprintf(stderr, "Usage: %s -r ref -t tol\n", argv[0]); exit(1); } //Add code to note start time and date and then print it. //Right now printing just a default string struct tm *local; time_t start, end; time(&start); // read and record clock local = localtime(&start); printf("\n# Start time and date: %s", asctime(local)); //char * tnd="Wed 15 Oct 2014 19:18:13 IST"; //printf("# Start time and date: %s", tnd ); // Add rest of the functionality. //READ int rows; // Sixe x axis of the array int cols; // Sixe y axis o the array scanf("%d" , &rows); scanf("%d" , &cols); double opArray[rows][cols]; // Array for operations for(i = 0 ; i < rows; i++) { for(c = 0 ; c < cols; c++) { scanf("%lf" , &opArray[i][c]); } } //read in the matrix double **mat = (double **) malloc(sizeof(double *)*rows); int j=0; for(i=0; i<rows; i++) /* Allocate array, store pointer */ mat[i] = (double *) malloc(sizeof(double)*cols); for(i=0; i<rows; i++) { for(j=0; j<cols; j++) { scanf("%lf",&mat[i][j]); } } // The following print statement should be a part of a loop // Uncomment it tailor it to your code but ONLY the part that // comes after: \n", // fprintf(stdout, "r=%d, c=%d: %.6f\n", r, c, rows[r][c]); for(i= 0; i < rows ; i++) { for(j = 0 ; j <cols ; j++) { ret = approxEqual(mat[i][j],refDub,tolDub); if (ret == 1) { fprintf(stdout, "r=%d, c=%d: %.6f\n", i, j, mat[i][j]); count++; } } } // output the final count of matches. Again, you may ONLY modify // the part of the print statement after: \n", // fprintf(stdout, "Found %d approximate matches.\n", count); //finally, print out the end time and date. Right now only printing //a default string. time(&end); // read and record clock local = localtime(&end); printf("\n# End time and date: %s", asctime(local)); exit(0); }
utils.c
#include "utils.h" int approxEqual(double x, double r, double t) { int ceiling = r+t; int floored = rt; if(x > floored && x < ceiling) return 1; else return 0; }
utils.h
#if ! defined(UTILS_H) #define UTILS_H int approxEqual(double x, double r, double t); #endif
如果有人能指出我正确的方向，那将是伟大的
我怎么编译它
gcc -c utils.c gcc findvals.o utils.o -o findvals gcc -c findvals.c
gcc -c utils.c findvals.c utils.h
gcc findvals.o utils.o -o findvals
检查一下。 这会奏效。
使用如下所示的makefile。
.PHONY: all clean SRCS := findvals.c utils.c OBJS := $(SRCS:%.c=%.o) all: findvals findvals: $(OBJS) clean: rm -rf *.o findvals
只需将此文件保存在与源相同的目录中，将其命名为“makefile”或“Makefile”并使用该命令
make
作为旁注。 在您的main函数中，您应该添加一个检查，因为用户没有提供足够的命令行参数。 您可以通过使用argc变量来判断提供了多少，并且您不应该引用任何高于argc – 1的 argv值，否则您将崩溃。